0001486957-22-000005 | 10-K | XBRL Viewer

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Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 33,891	$ 42,610
Restricted cash and cash equivalents	2,896	3,070
Investments	3,811	3,707
Accounts receivable – trade, net	70,663	153,368
Accounts receivable – other	16,651	22,239
Retainages	51,507	55,172
Contracts in progress	546,595	449,176
Other current assets	47,718	44,256
Total Current Assets	773,732	773,598
Property, Plant and Equipment, Net	1,045,640	816,471
Investments	9,558	9,356
Goodwill	285,502	283,708
Deferred Income Taxes	21,394	49,415
Investments in Unconsolidated Affiliates	85,284	71,806
Intangible Assets	185,551	192,751
Other Assets	94,719	96,398
TOTAL	2,501,380	2,293,503
Current Liabilities:
Bank overdraft	0	88,694
Accounts payable	189,842	184,392
Accrued employee benefits	71,835	89,740
Accrued liabilities – other	80,998	78,028
Advance billings on contracts	111,619	83,581
Accrued warranty expense	5,321	5,292
Total Current Liabilities	459,615	529,727
Long-Term Debt	1,189,304	862,731
Accumulated Postretirement Benefit Obligation	24,333	25,689
Environmental Liabilities	92,642	84,153
Pension Liability	59,388	144,859
Other Liabilities	38,863	28,576
Commitments and Contingencies (Note 10)
Stockholders' Equity:
Common stock, par value $0.01 per share, authorized 325,000,000 shares; issued 127,311,985 and 127,009,536 shares at December 31, 2021 and 2020, respectively	1,273	1,270
Preferred stock, par value $0.01 per share, authorized 75,000,000 shares; no shares issued	0	0
Capital in excess of par value	174,288	153,800
Retained earnings	1,775,751	1,549,950
Treasury stock at cost, 35,915,747 and 31,698,747 shares at December 31, 2021 and 2020, respectively	(1,326,280)	(1,095,452)
Accumulated other comprehensive income (loss)	12,143	8,198
Stockholders' Equity – BWX Technologies, Inc.	637,175	617,766
Noncontrolling interest	60	2
Total Stockholders' Equity	637,235	617,768
TOTAL	$ 2,501,380	$ 2,293,503

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	325,000,000	325,000,000
Common stock, shares issued (in shares)	127,311,985	127,009,536
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	75,000,000	75,000,000
Preferred stock, shares issued (in shares)	0	0
Treasury stock at cost (in shares)	35,915,747	31,698,747

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
Consolidated Statements of Income - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenues	$ 2,124,074	$ 2,123,516	$ 1,894,920
Costs and Expenses:
Cost of operations	1,573,797	1,548,119	1,361,056
Research and development costs	11,059	14,189	17,672
Losses (gains) on asset disposals and impairments, net	(3,532)	(1,361)	2,824
Selling, general and administrative expenses	230,400	231,169	216,771
Total Costs and Expenses	1,811,724	1,792,116	1,598,323
Equity in Income of Investees	33,498	27,152	28,924
Operating Income	345,848	358,552	325,521
Other Income (Expense):
Interest income	416	518	942
Interest expense	(35,758)	(31,014)	(35,320)
Other – net	85,207	34,116	22,599
Other Income (Expense)	49,865	3,620	(11,779)
Total before tax	395,713	362,172	313,742
Provision for Income Taxes	89,425	82,976	69,065
Net Income	306,288	279,196	244,677
Net Income Attributable to Noncontrolling Interest	(417)	(526)	(562)
Net Income Attributable to BWX Technologies, Inc.	$ 305,871	$ 278,670	$ 244,115
Basic:
Net income attributable to BWX Technologies, Inc. (USD per share)	$ 3.24	$ 2.92	$ 2.56
Diluted:
Net income attributable to BWX Technologies, Inc. (USD per share)	$ 3.24	$ 2.91	$ 2.55
Shares used in the computation of earnings per share (Note 17):
Basic (in shares)	94,278,894	95,457,193	95,377,414
Diluted (in shares)	94,518,422	95,726,497	95,810,538

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 306,288	$ 279,196	$ 244,677
Other Comprehensive Income (Loss):
Currency translation adjustments	6,173	15,685	5,263
Derivative financial instruments:
Unrealized losses arising during the period, net of tax benefit of $170, $24 and $442, respectively	(500)	(73)	(1,586)
Reclassification adjustment for losses (gains) included in net income, net of tax (benefit) provision of $(103), $173 and $(310), respectively	302	(487)	888
Benefit obligations:
Unrecognized losses arising during the period, net of tax benefit of $1,301, $513 and $1,274, respectively	(4,415)	(1,820)	(4,249)
Recognition of benefit plan costs, net of tax benefit of $(624), $(645) and $(562), respectively	2,295	2,532	2,030
Investments:
Unrealized gains (losses) arising during the period, net of tax provision of $(24), $(56) and $(3), respectively	90	(191)	418
Other Comprehensive Income (Loss)	3,945	15,646	2,764
Total Comprehensive Income	310,233	294,842	247,441
Comprehensive Income Attributable to Noncontrolling Interest	(417)	(526)	(562)
Comprehensive Income Attributable to BWX Technologies, Inc.	$ 309,816	$ 294,316	$ 246,879

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Derivative financial instruments, unrealized (losses) gains, tax benefit (provision)	$ 170	$ 24	$ 442
Derivative financial instruments, reclassification adjustment, unrealized tax provision (benefit)	(103)	173	(310)
Benefit obligations, recognition of plan costs, tax benefit	1,301	513	1,274
Benefit obligations, recognition of plan costs, tax benefit	(624)	(645)	(562)
Investments, unrealized (losses) gains, tax provision	$ (24)	$ (56)	$ (3)

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Capital In Excess of Par Value	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Stockholders' Equity	Stockholders' Equity Cumulative Effect, Period of Adoption, Adjustment	Noncontrolling Interest
Balance (in shares) at Dec. 31, 2018			125,871,866
Balance at Dec. 31, 2018	$ 235,701	$ (1,142)	$ 1,259	$ 115,725	$ 1,166,762	$ (1,219)	$ (10,289)	$ 77	$ (1,037,795)	$ 235,662	$ (1,142)	$ 39
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	244,677				244,115					244,115		562
Dividends declared	(65,275)				(65,275)					(65,275)
Currency translation adjustments	5,263						5,263			5,263
Derivative financial instruments	(698)						(698)			(698)
Defined benefit obligations	(2,219)						(2,219)			(2,219)
Available-for-sale investments	418						418			418
Exercises of stock options (in shares)			246,967
Exercises of stock options	5,625		$ 2	5,623						5,625
Shares placed in treasury	(30,369)								(30,369)	(30,369)
Stock-based compensation charges (in shares)			460,452
Stock-based compensation charges	12,726		$ 5	12,721						12,726
Distributions to noncontrolling interests	(595)											(595)
Balance (in shares) at Dec. 31, 2019			126,579,285
Balance at Dec. 31, 2019	404,112	0	$ 1,266	134,069	1,344,383	0	(7,448)	0	(1,068,164)	404,106	0	6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	279,196				278,670					278,670		526
Dividends declared	(73,103)				(73,103)					(73,103)
Currency translation adjustments	15,685						15,685			15,685
Derivative financial instruments	(560)						(560)			(560)
Defined benefit obligations	712						712			712
Available-for-sale investments	(191)						(191)			(191)
Exercises of stock options (in shares)			95,750
Exercises of stock options	2,891		$ 1	2,890						2,891
Shares placed in treasury	(27,288)								(27,288)	(27,288)
Stock-based compensation charges (in shares)			334,501
Stock-based compensation charges	16,844		$ 3	16,841						16,844
Distributions to noncontrolling interests	$ (530)											(530)
Balance (in shares) at Dec. 31, 2020	127,009,536		127,009,536
Balance at Dec. 31, 2020	$ 617,768	$ 0	$ 1,270	153,800	1,549,950	$ 0	8,198	$ 0	(1,095,452)	617,766	$ 0	2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	306,288				305,871					305,871		417
Dividends declared	(80,070)				(80,070)					(80,070)
Currency translation adjustments	6,173						6,173			6,173
Derivative financial instruments	(198)						(198)			(198)
Defined benefit obligations	(2,120)						(2,120)			(2,120)
Available-for-sale investments	90						90			90
Exercises of stock options (in shares)			76,682
Exercises of stock options	1,878		$ 0	1,878						1,878
Shares placed in treasury	(230,828)								(230,828)	(230,828)
Stock-based compensation charges (in shares)			225,767
Stock-based compensation charges	18,613		$ 3	18,610						18,613
Distributions to noncontrolling interests	$ (359)											(359)
Balance (in shares) at Dec. 31, 2021	127,311,985		127,311,985
Balance at Dec. 31, 2021	$ 637,235		$ 1,273	$ 174,288	$ 1,775,751		$ 12,143		$ (1,326,280)	$ 637,175		$ 60

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]
Dividends declared (usd per share)	$ 0.84	$ 0.76	$ 0.68

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 306,288	$ 279,196	$ 244,677
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	69,080	60,674	61,722
Income of investees, net of dividends	(13,023)	(2,147)	(7,969)
Provision for deferred taxes	40,091	7,890	3,794
Recognition of (gains) losses for pension and postretirement plans	(36,647)	9,548	6,222
Stock-based compensation expense	18,613	16,844	12,726
Premium for early redemption of senior notes	10,752	0	0
Recognition of debt issuance costs from former debt instruments	4,212	665	0
Other, net	1,401	(1,457)	963
Changes in assets and liabilities, net of effects from acquisitions:
Accounts receivable	84,006	(98,302)	15,605
Accounts payable	28,795	(1,241)	44,592
Retainages	3,875	(8,578)	11,477
Contracts in progress and advance billings on contracts	(67,137)	(53,242)	(78,645)
Income taxes	4,116	1,157	(3,833)
Accrued and other current liabilities	(1,991)	6,843	(14,135)
Pension liabilities, accrued postretirement benefit obligations and employee benefits	(69,424)	(29,311)	(8,822)
Other, net	3,019	7,903	(9,006)
NET CASH PROVIDED BY OPERATING ACTIVITIES	386,026	196,442	279,368
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(311,052)	(255,027)	(182,124)
Acquisition of businesses	0	(15,905)	0
Purchases of securities	(4,739)	(4,232)	(4,208)
Sales and maturities of securities	5,553	6,360	5,874
Other, net	5,585	3,485	463
NET CASH USED IN INVESTING ACTIVITIES	(304,653)	(265,319)	(179,995)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	1,324,300	844,500	699,600
Repayments of long-term debt	(999,300)	(794,676)	(654,095)
Premium for early redemption of senior notes	(10,752)	0	0
Payment of debt issuance costs	(4,838)	(6,803)	0
Borrowings and repayments of bank overdraft	(88,694)	88,694	0
Repurchases of common stock	(225,786)	(21,960)	(20,000)
Dividends paid to common shareholders	(79,668)	(72,940)	(65,374)
Exercises of stock options	2,033	2,812	4,446
Cash paid for shares withheld to satisfy employee taxes	(5,042)	(5,249)	(9,190)
Other, net	(2,389)	(9,332)	900
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(90,136)	25,046	(43,713)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	240	(271)	332
TOTAL (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AND CASH EQUIVALENTS	(8,523)	(44,102)	55,992
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	48,298	92,400	36,408
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AND CASH EQUIVALENTS AT END OF PERIOD	39,775	48,298	92,400
Cash paid during the period for:
Interest	50,840	38,267	39,670
Income taxes (net of refunds)	44,949	73,589	70,056
SCHEDULE OF NON-CASH INVESTING ACTIVITY:
Accrued capital expenditures included in accounts payable	$ 27,495	$ 51,492	$ 39,528

Basis of Presentation and Significant Accounting Policies

12 Months Ended

Dec. 31, 2021

Accounting Policies [Abstract]

Basis of Presentation and Significant Accounting Policies

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES

We have presented the consolidated financial statements of BWX Technologies, Inc. ("BWXT") in U.S. dollars in accordance with accounting principles generally accepted in the United States ("GAAP").

We use the equity method to account for investments in entities that we do not control, but over which we have the ability to exercise significant influence. We generally refer to these entities as "joint ventures." We have eliminated all intercompany transactions and accounts. We have reclassified certain amounts previously reported to conform to the presentation at December 31, 2021 and for the year ended December 31, 2021. On June 30, 2015, we completed the spin-off of our former Power Generation business (the "spin-off") into an independent, publicly traded company named Babcock & Wilcox Enterprises, Inc. ("BWE"). We present the notes to our consolidated financial statements on the basis of continuing operations, unless otherwise stated.

Unless the context otherwise indicates, "we," "us" and "our" mean BWXT and its consolidated subsidiaries.

Reportable Segments

We operate in three reportable segments: Nuclear Operations Group, Nuclear Power Group and Nuclear Services Group. Our reportable segments are further described as follows:

•Our Nuclear Operations Group segment manufactures naval nuclear reactors for the U.S. Naval Nuclear Propulsion Program for use in submarines and aircraft carriers. Through this segment, we own and operate manufacturing facilities located in Lynchburg, Virginia; Barberton, Ohio; Mount Vernon, Indiana; Euclid, Ohio; and Erwin, Tennessee. The Lynchburg operations fabricate fuel-bearing precision components that range in weight from a few grams to hundreds of tons. In-house capabilities also include wet chemistry uranium processing, advanced heat treatment to optimize component material properties and a controlled, clean-room environment with the capacity to assemble railcar-size components. The Barberton and Mount Vernon locations specialize in the design and manufacture of heavy components inclusive of fabrication activities for submarine missile launch tubes. The Euclid facility fabricates electro-mechanical equipment and performs design, manufacturing, inspection, assembly and testing activities. Fuel for the naval nuclear reactors is provided by Nuclear Fuel Services, Inc. ("NFS"), one of our wholly owned subsidiaries. Located in Erwin, NFS also downblends Cold War-era government stockpiles of high-enriched uranium.

•Our Nuclear Power Group segment fabricates commercial nuclear steam generators, nuclear fuel, fuel handling systems, pressure vessels, reactor components, heat exchangers, tooling delivery systems and other auxiliary equipment, including containers for the storage of spent nuclear fuel and other high-level waste and supplies nuclear-grade materials and precisely machined components for nuclear utility customers. BWXT has supplied the nuclear industry with more than 1,300 large, heavy components worldwide and is the only commercial heavy nuclear component manufacturer in North America. This segment also provides specialized engineering services that include structural component design, 3-D thermal-hydraulic engineering analysis, weld and robotic process development, electrical and controls engineering and metallurgy and materials engineering. In addition, this segment offers in-plant inspection, maintenance and modification services for nuclear steam generators, heat exchangers, reactors, fuel handling systems and balance of plant equipment, as well as specialized non-destructive examination and tooling/repair solutions. This segment is also a leading global manufacturer and supplier of critical medical radioisotopes and radiopharmaceuticals for research, diagnostic and therapeutic uses.

•Our Nuclear Services Group segment provides various services to the U.S. Government including nuclear materials management and operation, environmental management and administrative and operating services for various U.S. Government-owned facilities. These services are provided to the U.S. Department of Energy ("DOE"), including the National Nuclear Security Administration ("NNSA"), the Office of Nuclear Energy, the Office of Science and the Office of Environmental Management, and NASA. Through this segment we deliver services and management solutions to nuclear and high-consequence operations. A significant portion of this segment's operations is conducted through joint ventures. This segment also develops technology for a variety of applications, including advanced nuclear power sources, and offers complete advanced nuclear fuel and reactor design and engineering, licensing and manufacturing services for new advanced nuclear reactors.

See Note 15 and Note 3 for financial information about our segments.

During the first quarter of 2022, we made changes to our reportable segments to better align our businesses by their government and commercial nature, which reflects the manner in which resources will be allocated and operating performance will be assessed going forward. Beginning with first quarter of 2022 reporting, our reportable segments will be Government Operations and Commercial Operations, and both segments will now include research and development and certain commercialization activities associated with new technologies previously reported centrally, outside of our reportable segments. Our Government Operations segment will consist of our legacy Nuclear Operations Group and Nuclear Services Group segments with certain research and development activities in the areas of advanced reactors and autonomous manufacturing. Our Commercial Operations segment will consist of our legacy Nuclear Power Group with certain research and development and commercialization activities in the areas of medical and industrial radioisotopes.

Divestiture of U.S.-Based Commercial Nuclear Services Business

On May 29, 2020, our subsidiary BWXT Nuclear Energy, Inc. divested its U.S.-based commercial nuclear services business, a component of our Nuclear Services Group segment. In a cashless transaction, we exchanged net assets totaling $18.0 million, consisting primarily of property, plant and equipment and certain warranty obligations, for a manufacturing facility and the associated land of approximately the same value. The acquired assets are reported as part of the Nuclear Services Group segment.

Recently Adopted Accounting Standards

There were no accounting standards adopted during the year ended December 31, 2021 that had an impact on our financial position, results of operations, cash flows or disclosures.

Use of Estimates

We use estimates and assumptions to prepare our financial statements in conformity with GAAP. Some of our more significant estimates include estimates of costs to complete long-term contracts and the associated revenues, estimates of the fair value of acquired intangible and other assets, estimates we make in selecting assumptions related to the valuations of our pension and postretirement benefit plans, including the selection of our discount rates, mortality and expected rates of return on our pension plan assets and estimates we make in evaluating our asset retirement obligations. These estimates and assumptions affect the amounts we report in our financial statements and accompanying notes. Our actual results could differ from these estimates. Variances could result in a material effect on our financial condition and results of operations in future periods.

Contracts and Revenue Recognition

We generally recognize contract revenues and related costs over time for individual performance obligations based on a cost-to-cost method in accordance with FASB Topic Revenue from Contracts with Customers. We recognize estimated contract revenue and resulting income based on the measurement of the extent of progress toward completion as a percentage of the total project. Certain costs may be excluded from the cost-to-cost method of measuring progress, such as significant costs for uninstalled materials, if such costs do not depict our performance in transferring control of goods or services to the customer. We review contract price and cost estimates periodically as the work progresses and reflect adjustments proportionate to the percentage-of-completion in income in the period when those estimates are revised. Certain of our contracts recognize revenue at a point in time, and revenue on these contracts is recognized when control transfers to the customer. The majority of our revenue that is recognized at a point in time is related to parts and certain medical radioisotopes and radiopharmaceuticals in our Nuclear Power Group segment. For all contracts, if a current estimate of total contract cost indicates a loss on a contract, the projected loss is recognized in full when determined.

Warranty Expense

We accrue estimated warranty expense, included in Cost of operations on our consolidated statements of income, to satisfy contractual warranty requirements when we recognize the associated revenue on the related contracts. In addition, we record specific provisions or reductions where we expect the actual warranty costs to significantly differ from the accrued estimates. Such changes could have a material effect on our consolidated financial condition, results of operations and cash flows.

The following summarizes the changes in the carrying amount of Accrued warranty expense:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Balance at beginning of period	$	5,292	$	9,042	$	10,344
Additions	924		1,341		2,232
Expirations and other changes (1)	(424)		(1,624)		(2,728)
Payments	(605)		(1,026)		(1,065)
Translation and other (2)	134		(2,441)		259
Balance at end of period	$	5,321	$	5,292	$	9,042

(1)Includes discounts provided to customers in satisfaction of warranty obligations totaling $(1.2) million in the year ended December 31, 2019.

(2)Includes $(2.5) million related to the divestiture of the U.S.-based commercial nuclear services business during the year ended December 31, 2020.

Stock-Based Compensation

We expense stock-based compensation in accordance with FASB Topic Compensation – Stock Compensation. Under this topic, the fair value of equity-classified awards, such as restricted stock, performance shares and stock options, is determined on the date of grant and is not remeasured. The fair value of liability-classified awards, such as cash-settled stock appreciation rights, restricted stock units and performance units, is determined on the date of grant and is remeasured at the end of each reporting period through the date of settlement. Grant date fair values for restricted stock, restricted stock units, performance shares and performance units are determined using the closing price of our common stock on the date of grant.

Under the provisions of this FASB topic, we recognize expense for all share-based awards granted on a straight-line basis over the requisite service periods of the awards, which is generally equivalent to the vesting term. This topic requires compensation expense to be recognized such that compensation expense is recorded only for those awards expected to vest. As a result, we periodically review the amount of actual forfeitures and record any adjustments deemed necessary each reporting period. We also recognize excess tax benefits in our provision for income taxes. These excess tax benefits result from tax deductions in excess of the cumulative compensation expense recognized for options exercised and other equity-classified awards.

See Note 9 for a further discussion of stock-based compensation.

Grant Accounting

We recognize amounts related to grants as a reduction of expense in the period in which the related costs for which the grants are intended to compensate are recognized and we are reasonably assured to receive payment.

On April 11, 2020, the Canadian Government enacted the Canada Emergency Wage Subsidy ("CEWS") under the COVID-19 Economic Response Plan to prevent large layoffs and help employers offset a portion of their employee salaries and wages for a limited period. During the years ended December 31, 2021 and 2020, we recognized subsidies under the CEWS as offsets to operating expenses of $5.4 million and $20.4 million, respectively.

Research and Development

Our research and development activities are related to the development and improvement of new and existing products and equipment, as well as conceptual and engineering evaluation for translation into practical applications. We charge the costs of research and development unrelated to specific contracts as incurred. Contractual arrangements for customer-sponsored research and development can vary on a case-by-case basis.

Research and development activities totaled $31.4 million, $40.8 million and $66.9 million in the years ended December 31, 2021, 2020 and 2019, respectively. This includes amounts paid for by our customers of $20.3 million, $26.6 million and $49.2 million, in the years ended December 31, 2021, 2020 and 2019, respectively.

Capitalization of Interest Cost

We capitalize interest in accordance with FASB Topic Interest. We incurred total interest of $51.1 million, $40.8 million and $41.4 million in the years ended December 31, 2021, 2020 and 2019, respectively, of which we capitalized $15.3 million, $9.8 million and $6.1 million in the years ended December 31, 2021, 2020 and 2019, respectively.

Income Taxes

Income tax expense for federal, foreign, state and local income taxes is calculated on pre-tax income based on current tax law and includes the cumulative effect of any changes in tax rates from those used previously in determining deferred tax assets and liabilities. We record a valuation allowance to reduce our deferred tax assets to the amount that is more likely than not to be realized. We assess deferred taxes and the adequacy of the valuation allowance on a quarterly basis. In the ordinary course of business, there is inherent uncertainty in quantifying our income tax positions. We assess our income tax positions and record tax benefits for all years subject to examination based upon management's evaluation of the facts, circumstances and information available at the reporting date. For those tax positions where it is more likely than not that a tax benefit will be sustained, we have recorded the largest amount of tax benefit with a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is not more likely than not that a tax benefit will be sustained, no tax benefit has been recognized in the financial statements. We record interest and penalties (net of any applicable tax benefit) related to income taxes as a component of Provision for Income Taxes on our consolidated statements of income.

We would be subject to withholding taxes if we were to distribute earnings from certain foreign subsidiaries, and unrecognized deferred income tax liabilities, including withholding taxes, would be payable upon distribution of these earnings. We consider the earnings of our non-U.S. subsidiaries to be permanently reinvested.

Earnings Per Share

We have computed earnings per common share on the basis of the weighted-average number of common shares, and, where dilutive, common share equivalents, outstanding during the indicated periods. We issue a number of forms of stock-based compensation periodically, including incentive and non-qualified stock options, restricted stock, restricted stock units, performance shares and performance units, subject to satisfaction of specific performance goals. We include the shares applicable to these plans in our computation of diluted earnings per share when related performance criteria have been met.

Cash and Cash Equivalents and Restricted Cash and Cash Equivalents

Our cash equivalents are highly liquid investments with maturities of three months or less when we purchase them.

We record cash and cash equivalents as restricted when we are unable to freely use such cash and cash equivalents for our general operating purposes. At December 31, 2021, we had restricted cash and cash equivalents totaling $5.9 million, $3.0 million of which was held for future decommissioning of facilities (which is included in Other Assets on our consolidated balance sheets) and $2.9 million of which was held to meet reinsurance reserve requirements of our captive insurer.

The following table provides a reconciliation of cash and cash equivalents and restricted cash and cash equivalents on our consolidated balance sheets to the totals presented on our consolidated statements of cash flows:


	December 31,
	2021		2020
	(In thousands)
Cash and cash equivalents	$	33,891	$	42,610
Restricted cash and cash equivalents	2,896		3,070
Restricted cash and cash equivalents included in Other Assets	2,988		2,618
Total cash and cash equivalents and restricted cash and cash equivalents as presented on our consolidated statements of cash flows	$	39,775	$	48,298

Investments

Our investment portfolio consists primarily of U.S. Government securities, corporate bonds and equities and mutual funds. Our debt securities are carried at fair value and are either classified as trading, with unrealized gains and losses reported in earnings, or as available-for-sale, with the unrealized gains and losses, net of tax, reported as a component of Accumulated

other comprehensive income. Our equity securities are carried at fair value with the unrealized gains and losses reported in earnings. We classify investments available for current operations in the consolidated balance sheets as current assets, while we classify investments held for long-term purposes as non-current assets. We adjust the amortized cost of debt securities for amortization of premiums and accretion of discounts to maturity, and such adjustments are included in Interest income. We include realized gains and losses on our investments in Other – net. The cost of securities sold is based on the specific identification method. We include interest on investments in Interest income.

Inventories

We carry our inventory at the lower of cost or net realizable value using either the weighted average or first-in, first-out methods. At December 31, 2021 and 2020, Other current assets included inventories totaling $16.3 million and $15.0 million, respectively, consisting entirely of raw materials and supplies.

Property, Plant and Equipment

We carry our property, plant and equipment at depreciated cost, less any impairment provisions. We depreciate our property, plant and equipment using the straight-line method over estimated economic useful lives of eight to 40 years for buildings and three to 14 years for machinery and equipment. Our depreciation expense was $58.1 million, $50.3 million and $51.0 million for the years ended December 31, 2021, 2020 and 2019, respectively. We expense the costs of maintenance, repairs and renewals that do not materially prolong the useful life of an asset as we incur them.

Property, plant and equipment is stated at cost and is set forth below:


	December 31,
	2021		2020
	(In thousands)
Land	$	9,538	$	9,585
Buildings	321,872		267,808
Machinery and equipment	957,423		827,785
Property under construction	487,856		420,374
	1,776,689		1,525,552
Less: Accumulated depreciation	731,049		709,081
Property, Plant and Equipment, Net	$	1,045,640	$	816,471

Goodwill

Goodwill represents the excess of the cost of our acquired businesses over the fair value of the net assets acquired. We perform testing of goodwill for impairment annually or more frequently whenever events or circumstances indicate the carrying value of goodwill may be impaired. We may elect to perform a qualitative test when we believe that there is sufficient excess fair value over carrying value based on our most recent quantitative assessment, adjusted for relevant events and circumstances that could affect fair value during the current year. If we conclude based on this assessment that it is more likely than not that the reporting unit is not impaired, we do not perform a quantitative impairment test. In all other circumstances, we compare the fair value of a reporting unit to its carrying amount, including goodwill. If the fair value of the reporting unit exceeds its carrying value, no impairment charge is recorded. If the carrying amount of a reporting unit exceeds its fair value, an impairment charge is recorded to goodwill in the amount by which carrying value exceeds fair value.

The following summarizes the changes in the carrying amount of Goodwill:


	Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total
	(In thousands)
Balance at December 31, 2019	$	110,939	$	119,563	$	45,000	$	275,502
Acquisition of Precision Manufacturing (Note 2)	—		5,753		—		5,753
Translation	—		2,453		—		2,453
Balance at December 31, 2020	$	110,939	$	127,769	$	45,000	$	283,708

Translation	—		1,794		—		1,794
Balance at December 31, 2021	$	110,939	$	129,563	$	45,000	$	285,502

Investments in Unconsolidated Affiliates

We use the equity method of accounting for affiliates in which we are able to exert significant influence. Currently, all of our material investments in affiliates that are not consolidated are recorded using the equity method. Affiliates in which we are unable to exert significant influence are carried at fair value.

Intangible Assets

Intangible assets are recognized at fair value when acquired. Intangible assets with definite lives are amortized to Costs and Expenses using the straight-line method over their estimated useful lives and tested for impairment when events or changes in circumstances indicate that their carrying amounts may not be recoverable. Intangible assets with indefinite lives are not amortized and are subject to annual impairment testing. We may elect to perform a qualitative assessment when testing indefinite-lived intangible assets for impairment to determine whether events or circumstances affecting significant inputs related to the most recent quantitative evaluation have occurred, indicating that it is more likely than not that the indefinite-lived intangible asset is impaired. Otherwise, we test indefinite-lived intangible assets for impairment by quantitatively determining the fair value of the indefinite-lived intangible asset and comparing the fair value of the intangible asset to its carrying amount. If the carrying amount of the intangible asset exceeds its fair value, we recognize impairment for the amount of the difference.

Our Intangible Assets were as follows:


	December 31,
	2021		2020		2019
	(In thousands)
Amortized intangible assets:
Gross cost:
Technical support agreement	$	69,781	$	68,785	$	67,423
Customer relationships	40,247		39,954		39,555
Unpatented technology	38,073		37,529		36,785

CNSC class 1B nuclear facility license	26,911		26,528		26,002
Acquired backlog	7,595		7,487		—
Patented technology	792		780		765

All other	871		858		2,200
Total	$	184,270	$	181,921	$	172,730
Accumulated amortization:
Technical support agreement	$	(10,366)	$	(7,227)	$	(4,153)
Customer relationships	(18,176)		(15,996)		(13,841)
Unpatented technology	(6,398)		(4,584)		(2,805)

CNSC class 1B nuclear facility license	(4,521)		(3,573)		(2,635)
Acquired backlog	(2,531)		(1,248)		—
Patented technology	(363)		(286)		(212)

All other	(194)		(86)		(1,522)
Total	$	(42,549)	$	(33,000)	$	(25,168)
Net amortized intangible assets	$	141,721	$	148,921	$	147,562
Unamortized intangible assets:
NRC category 1 license	$	43,830	$	43,830	$	43,830

The following summarizes the changes in the carrying amount of Intangible Assets:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Balance at beginning of period	$	192,751	$	191,392	$	228,676
Acquisitions (Note 2)	—		8,180		—
Amortization expense	(9,329)		(8,824)		(9,128)
Reclassification of right-of-use assets	—		—		(33,866)
Translation and other (1)	2,129		2,003		5,710
Balance at end of period	$	185,551	$	192,751	$	191,392

(1)Includes $(0.6) million related to the divestiture of the U.S.-based commercial nuclear services business during the year ended December 31, 2020.

Estimated amortization expense for the next five fiscal years is as follows (amounts in thousands):


Year Ended December 31,	Amount
2022	$	9,257
2023	$	9,257
2024	$	9,257
2025	$	9,257
2026	$	7,991

Leases

We lease certain manufacturing facilities, office space and equipment under operating leases with terms of one to 20 years. Certain of the leases include options to renew for periods of one to 10 years. We include lease options in our determination of the right-of-use asset and lease liability if it is reasonably certain that we will exercise one or more of the options. Leases with initial terms of 12 months or less are excluded from our right-of-use assets and lease liabilities. Our right-of-use assets are included in Other Assets on our consolidated balance sheets. Our current lease liabilities are included in Accrued liabilities – other, and our noncurrent lease liabilities are included in Other Liabilities on our consolidated balance sheets. We use discount rates based on our incremental borrowing rate as most of our leases do not provide an implicit rate that can be readily determined.

During the year ended December 31, 2021, we recognized lease expense of $8.4 million, which included $1.7 million related to the amortization of favorable lease agreements, and paid cash of $6.7 million for our operating leases. During the years ended December 31, 2020 and 2019, we recognized lease expense of $7.7 million and $8.1 million, respectively. At December 31, 2021, our weighted-average remaining lease term was 6.7 years, and for the purpose of measuring the present value of our lease liabilities, the weighted-average discount rate was 4.19%. The maturities of our lease liabilities at December 31, 2021 were as follows (amounts in thousands):


2022	$	3,979
2023	2,664
2024	2,225
2025	1,849
2026	1,831
Thereafter	5,025
Total lease payments	$	17,573
Less: Interest	(2,445)
Present value of lease liabilities (1)	$	15,128

(1)Includes current lease liabilities of $3.9 million.

At December 31, 2021, our right-of-use assets totaled $46.4 million. The difference between the right-of-use assets and lease liabilities was primarily the result of our adoption of the update to the FASB Topic Leases on January 1, 2019, which resulted in reclassifications from Intangible Assets of favorable leases related to acquisitions.

Deferred Debt Issuance Costs

We have included deferred debt issuance costs in the consolidated balance sheets as a direct deduction from the carrying amount of our debt liability. We amortize deferred debt issuance costs as interest expense over the life of the related debt. The following summarizes the changes in the carrying amount of these assets:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Balance at beginning of period	$	12,269	$	8,006	$	9,583
Additions	4,838		6,803		—
Interest expense (1)	(6,411)		(2,540)		(1,577)
Balance at end of period	$	10,696	$	12,269	$	8,006

(1)Includes the recognition of prior deferred debt issuance costs associated with former debt instruments of $(4.2) million and $(0.7) million for the years ended December 31, 2021 and 2020, respectively.

Pension Plans and Postretirement Benefits

We sponsor various defined benefit pension and postretirement benefit plans covering certain employees of our U.S. and Canadian subsidiaries. We utilize actuarial valuations to calculate the cost and benefit obligations of our pension and postretirement benefits. The actuarial valuations utilize significant assumptions in the determination of our benefit cost and obligations, including assumptions regarding discount rates, expected returns on plan assets, mortality and health care cost trends. We determine our discount rate based on a yield curve comprising rates of return on high-quality, fixed-income investments currently available and expected to be available during the period to maturity of our pension and postretirement

benefit plan obligations. The expected rate of return on plan assets assumption is based on capital market assumptions of the long-term expected returns for the investment mix of assets currently in the portfolio. The expected rate of return on plan assets is determined to be the weighted-average of the nominal returns based on the weightings of the classes within the total asset portfolio. Expected health care cost trends represent expected annual rates of change in the cost of health care benefits and are estimated based on analysis of health care cost inflation.

The components of benefit cost related to service cost, interest cost, expected return on plan assets and prior service cost amortization are recorded on a quarterly basis based on actuarial assumptions. In the fourth quarter of each year, or as interim remeasurements are required, we immediately recognize net actuarial gains and losses in earnings as a component of net periodic benefit cost. Recognized net actuarial gains and losses consist primarily of our reported actuarial gains and losses and the difference between the actual return on plan assets and the expected return on plan assets.

We recognize the funded status of each plan as either an asset or a liability in the consolidated balance sheets. The funded status is the difference between the fair value of plan assets and the present value of its benefit obligation, determined on a plan-by-plan basis. Our pension plan assets can include assets that are difficult to value. See Note 7 for detailed information regarding our plan assets.

Asset Retirement Obligations and Environmental Cleanup Costs

We accrue for future decommissioning of our nuclear facilities that will permit the release of these facilities to unrestricted use at the end of each facility's service life, which is a requirement of our licenses from the U.S. Nuclear Regulatory Commission ("NRC") and the Canadian Nuclear Safety Commission ("CNSC"). In accordance with the FASB Topic Asset Retirement and Environmental Obligations, we record the fair value of a liability for an asset retirement obligation in the period in which it is incurred. When we initially record such a liability, we capitalize a cost by increasing the carrying amount of the related long-lived asset. When we acquire a business that has an asset retirement obligation, the asset retirement obligation is recognized at fair value without a corresponding increase to the related long-lived asset. Over time, the liability is accreted to its present value each period and the capitalized cost is depreciated over the useful life of the related asset. Upon settlement of a liability, we will settle the obligation for its recorded amount or incur a gain or loss. This topic applies to environmental liabilities associated with assets that we currently operate and are obligated to remove from service. For environmental liabilities associated with assets that we no longer operate, we have accrued amounts based on the estimated costs of cleanup activities for which we are responsible, net of any cost-sharing arrangements. We adjust the estimated costs as further information develops or circumstances change. Given the long-lived nature of these facilities, we are required to estimate retirement costs that will be incurred in the future, which may extend up to 40 years at the time the asset retirement obligation is established. Due to the significance of the remaining useful life of these facilities, the timing of retirement and future costs for material components of the asset retirement obligations, such as labor and waste disposal fees, could differ from our estimates. An exception to this accounting treatment relates to the work we perform for two facilities for which the U.S. Government is obligated to pay substantially all of the decommissioning costs.

Substantially all of our asset retirement obligations relate to the remediation of our nuclear analytical laboratory and the NFS facility in our Nuclear Operations Group segment as well as certain facilities in our Nuclear Power Group segment. The following summarizes the changes in the carrying amount of these liabilities:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Balance at beginning of period	$	78,110	$	77,288	$	90,822
Costs incurred	(215)		(1,608)		(10,380)
Additions/adjustments	—		(3,284)		(5,030)
Acquisitions	—		—		—
Accretion	5,996		5,343		5,379
Translation and other (1)	241		371		(3,503)
Balance at end of period (2)	$	84,132	$	78,110	$	77,288

(1)Includes an adjustment of $(4.3) million to correct the business combination accounting for our 2016 acquisition during the year ended December 31, 2019.

(2)Includes current asset retirement obligations of $4.7 million, $2.8 million and $5.7 million at December 31, 2021, 2020 and 2019, respectively.

Self-Insurance

We have a wholly owned insurance subsidiary that provides employer's liability, general and automotive liability and primary workers' compensation insurance and, from time to time, builder's risk insurance (within certain limits) to our companies. We may also, in the future, have this insurance subsidiary accept other risks that we cannot or do not wish to transfer to outside insurance companies. Included in Other Liabilities on our consolidated balance sheets are reserves for self-insurance totaling $4.5 million and $5.0 million at December 31, 2021 and 2020, respectively.

Loss Contingencies

We accrue liabilities for loss contingencies when it is probable that a liability has been incurred and the amount of loss is reasonably estimable. We provide disclosure when there is a reasonable possibility that the ultimate loss will exceed the recorded provision or if such probable loss is not reasonably estimable. Due to the nature of our business, we are, from time to time, involved in investigations, litigation, disputes or claims related to our business activities, as discussed in Note 10. Our losses are typically resolved over long periods of time and are often difficult to assess and estimate due to, among other reasons, the possibility of multiple actions by third parties; the attribution of damages, if any, among multiple defendants; plaintiffs, in most cases involving personal injury claims, do not specify the amount of damages claimed; the discovery process may take multiple years to complete; during the litigation process, it is common to have multiple complex unresolved procedural and substantive issues; the potential availability of insurance and indemnity coverages; the wide-ranging outcomes reached in similar cases, including the variety of damages awarded; the likelihood of settlements for de minimus amounts prior to trial; the likelihood of success at trial; and the likelihood of success on appeal. Consequently, it is possible future earnings could be affected by changes in our assessments of the probability that a loss has been incurred in a material pending litigation against us and/or changes in our estimates related to such matters.

Accumulated Other Comprehensive Income

The components of Accumulated other comprehensive income included in Stockholders' Equity are as follows:


	December 31,
	2021		2020
	(In thousands)
Currency translation adjustments	$	30,627	$	24,454
Net unrealized loss on derivative financial instruments	(694)		(496)
Unrecognized prior service cost on benefit obligations	(18,022)		(15,902)
Net unrealized gain on available-for-sale investments	232		142
Accumulated other comprehensive income	$	12,143	$	8,198

The amounts reclassified out of Accumulated other comprehensive income by component and the affected consolidated statements of income line items are as follows:


	Year Ended December 31,
	2021		2020		2019
Accumulated Other Comprehensive Income (Loss) Component Recognized	(In thousands)						Line Item Presented
Realized (loss) gain on derivative financial instruments	$	307	$	(35)	$	(132)	Revenues
	(712)		695		(1,066)		Cost of operations
	(405)		660		(1,198)		Total before tax
	103		(173)		310		Provision for Income Taxes
	$	(302)	$	487	$	(888)	Net Income
Amortization of prior service cost on benefit obligations	$	(2,919)	$	(3,177)	$	(2,592)	Other – net
	624		645		562		Provision for Income Taxes
	$	(2,295)	$	(2,532)	$	(2,030)	Net Income



Total reclassification for the period	$	(2,597)	$	(2,045)	$	(2,918)

Foreign Currency Translation

We translate assets and liabilities of our foreign operations into U.S. dollars at current exchange rates, and we translate income statement items at average exchange rates for the periods presented. We record adjustments resulting from the translation of foreign currency financial statements as a component of Accumulated other comprehensive income. We report foreign currency transaction gains and losses in income. We have included in Other – net transaction gains (losses) of $1.8 million, $(0.6) million and $1.0 million for the years ended December 31, 2021, 2020 and 2019, respectively.

Derivative Financial Instruments

Our operations give rise to exposure to market risks from changes in foreign currency exchange ("FX") rates. We use derivative financial instruments, primarily FX forward contracts, to reduce the impact of changes in FX rates on our operating results. We use these instruments to hedge our exposure associated with revenues or costs on our long-term contracts and other transactions that are denominated in currencies other than our operating entities' functional currencies. We do not hold or issue derivative financial instruments for trading or other speculative purposes.

We enter into derivative financial instruments primarily as hedges of certain firm purchase and sale commitments and loans between domestic and foreign subsidiaries denominated in foreign currencies. We record these contracts at fair value on our consolidated balance sheets. Based on the hedge designation at inception of the contract, the related gains and losses on these contracts are deferred in stockholders' equity as a component of Accumulated other comprehensive income until the hedged item is recognized in earnings. The gain or loss on a derivative instrument not designated as a hedging instrument is immediately recognized in earnings. Gains and losses on derivative financial instruments that require immediate recognition are included as a component of Other – net on our consolidated statements of income and are recorded in the statements of cash flows based on the nature and use of the instruments.

We have designated the majority of our FX forward contracts that qualify for hedge accounting as cash flow hedges. The hedged risk is the risk of changes in functional-currency-equivalent cash flows attributable to changes in FX spot rates of forecasted transactions primarily related to long-term contracts. We exclude from our assessment of effectiveness the portion of the fair value of the FX forward contracts attributable to the difference between FX spot rates and FX forward rates. At December 31, 2021, we had deferred approximately $(0.7) million of net losses on these derivative financial instruments. Assuming market conditions continue, we expect to recognize the majority of this amount in the next twelve months. For the years ended December 31, 2021, 2020 and 2019, we recognized $(0.1) million, $8.7 million and $(1.0) million, respectively, of (gains) losses associated with FX forward contracts not designated as hedging instruments.

At December 31, 2021, our derivative financial instruments consisted of FX forward contracts with a total notional value of $352.2 million with maturities extending to November 2023. These instruments consist primarily of FX forward contracts to purchase or sell Canadian dollars and Euros. We are exposed to credit-related losses in the event of non-performance by counterparties to derivative financial instruments. We attempt to mitigate this risk by using major financial institutions with high credit ratings. Our counterparties to derivative financial instruments have the benefit of the same collateral arrangements and covenants as described under our credit facility.

New Accounting Standards

In October 2021, the FASB issued an update to the Topic Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. This update requires entities to recognize and measure contract assets and liabilities acquired in a business combination in accordance with FASB Topic Revenue from Contracts with Customers. The update will generally result in an entity recognizing contract assets and liabilities at amounts consistent with those recorded by the acquiree immediately before the acquisition date rather than at fair value. The new standard is effective on a prospective basis for fiscal years beginning after December 15, 2022, with early adoption permitted. We are currently evaluating the impact, if any, of the adoption of this standard on our financial statements.

Acquisitions	12 Months Ended
Acquisitions	Dec. 31, 2021
Business Combination and Asset Acquisition [Abstract]
Acquisitions	ACQUISITIONS Laker Energy Products Ltd. On January 2, 2020, our subsidiary BWXT Canada Ltd. acquired Laker Energy Products Ltd., which was renamed BWXT Precision Manufacturing Inc. ("Precision Manufacturing"), for CAD 23.3 million ($17.8 million U.S. dollar equivalent). We were subject to the payment of contingent consideration of which we had recognized CAD 2.5 million as a component of the purchase price. Our purchase price allocation resulted in the recognition of $8.4 million of Property, Plant and Equipment, Net, $8.2 million of Intangible Assets and $5.8 million of Goodwill. In addition, we recognized right-of-use assets and lease liabilities of $2.7 million. During the year ended December 31, 2021, we entered into an agreement with the seller resulting in no contingent consideration due and recognized a gain of $2.0 million (CAD 2.5 million) as a component of Cost of operations. Precision Manufacturing is a global supplier of nuclear-grade materials and precisely machined components for CANDU nuclear power utilities and is reported as part of our Nuclear Power Group segment.

Revenue Recognition

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Revenue Recognition

REVENUE RECOGNITION

Contracts and Revenue Recognition

Nuclear Operations Group

Our Nuclear Operations Group segment recognizes revenue over time for the manufacturing of naval nuclear reactor components and fuel, submarine missile launch tubes and the downblending of high-enriched uranium. Certain of our contracts contain two or more different types of components, each of which we identify as a separate performance obligation. We recognize revenue using a cost-to-cost method to measure progress as control is continually transferred to the customer as we incur costs on the performance obligations. We allocate revenue to the individual performance obligations within contracts with multiple performance obligations based on the stand-alone selling price of the individual performance obligations.

Our fixed-price incentive fee contracts include incentives that we concluded to be variable consideration. The amount of the variable consideration to which we are entitled is dependent on our actual costs incurred on the performance obligation compared to the target costs for that performance obligation and subject to incentive price revisions included within the contracts. We include these incentive fees in revenue when there is sufficient evidence to determine that the variable consideration is not constrained. The remaining contracts typically have immaterial amounts of variable consideration and have a single performance obligation. Our estimates of variable consideration and total estimated costs at completion are determined through a detailed process based on historical performance and our expertise using the most likely method. Variations from estimated contract performance could result in a material effect on our financial condition and results of operations in future periods.

Our Nuclear Operations Group segment's contracts primarily allow for billings as costs are incurred, subject to certain retainages on our fixed-price incentive fee contracts that require milestones to be reached for the remaining consideration to be paid. Our fuel and downblending contracts allow billing when we achieve certain milestones related to our progress.

Nuclear Power Group

Our Nuclear Power Group segment recognizes revenue over time using a cost-to-cost method for the manufacturing of large components, non-standard parts, fuel bundles and service contracts as control continually transfers to the customers. For standard parts, revenue is recognized at the point in time control transfers to the customer, which is consistent with the transfer of ownership. For medical radioisotopes, we recognize revenue either at the point in time control transfers to the customer or over time using a unit of output method. This segment generates revenue primarily from firm-fixed-price contracts that do not contain variable consideration as well as time-and-materials based contracts. Certain of these contracts contain assurance warranties and/or provisions for liquidated damages, which are expected to have an immaterial impact to the contracts based on our historical experience. We are entitled to payment on the majority of our Nuclear Power Group segment contracts when we achieve certain milestones related to our progress.

Nuclear Services Group

Our contracts within our Nuclear Services Group segment are primarily cost-plus service contracts on which we recognize revenue over time based on a cost-to-cost method, which is consistent with the structure of the billings associated with these contracts. Ownership continuously transfers to the customer as we perform the services. The contracts within this segment do not contain significant variable consideration and contain a single performance obligation.

Disaggregated Revenues

We allocate geographic revenues based on the location of the customers' operations. Revenues by geographic area and customer type were as follows:


	Year Ended December 31, 2021								Year Ended December 31, 2020								Year Ended December 31, 2019
	Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total		Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total		Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total
	(In thousands)
United States:
Government	$	1,527,704	$	—	$	114,465	$	1,642,169	$	1,540,256	$	—	$	113,075	$	1,653,331	$	1,368,555	$	—	$	111,236	$	1,479,791
Non-Government	87,809		44,102		5,560		137,471		98,986		35,432		19,061		153,479		51,802		38,058		17,907		107,767
	$	1,615,513	$	44,102	$	120,025	$	1,779,640	$	1,639,242	$	35,432	$	132,136	$	1,806,810	$	1,420,357	$	38,058	$	129,143	$	1,587,558
Canada:

Non-Government	$	—	$	345,412	$	3,417	$	348,829	$	—	$	309,433	$	4,357	$	313,790	$	—	$	287,948	$	2,196	$	290,144

Other:

Non-Government	$	7,085	$	17,568	$	96	$	24,749	$	7,015	$	26,404	$	—	$	33,419	$	8,230	$	26,634	$	—	$	34,864

Segment Revenues	$	1,622,598	$	407,082	$	123,538	2,153,218		$	1,646,257	$	371,269	$	136,493	2,154,019		$	1,428,587	$	352,640	$	131,339	1,912,566
Eliminations							(29,144)								(30,503)								(17,646)
Revenues							$	2,124,074							$	2,123,516							$	1,894,920

Revenues by timing of transfer of goods or services were as follows:


	Year Ended December 31, 2021								Year Ended December 31, 2020								Year Ended December 31, 2019
	Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total		Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total		Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total
	(In thousands)								(In thousands)								(In thousands)
Over time	$	1,622,462	$	355,477	$	123,538	$	2,101,477	$	1,646,092	$	322,745	$	136,493	$	2,105,330	$	1,428,348	$	305,075	$	131,339	$	1,864,762
Point-in-time	136		51,605		—		51,741		165		48,524		—		48,689		239		47,565		—		47,804
Segment Revenues	$	1,622,598	$	407,082	$	123,538	2,153,218		$	1,646,257	$	371,269	$	136,493	2,154,019		$	1,428,587	$	352,640	$	131,339	1,912,566
Eliminations							(29,144)								(30,503)								(17,646)
Revenues							$	2,124,074							$	2,123,516							$	1,894,920

Revenues by contract type were as follows:


	Year Ended December 31, 2021								Year Ended December 31, 2020								Year Ended December 31, 2019
	Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total		Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total		Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total
	(In thousands)								(In thousands)								(In thousands)
Fixed-Price Incentive Fee	$	1,244,916	$	9,279	$	—	$	1,254,195	$	1,226,770	$	1,578	$	—	$	1,228,348	$	1,137,883	$	2,511	$	—	$	1,140,394
Firm-Fixed-Price	271,656		307,200		38,151		617,007		306,296		296,394		32,334		635,024		210,631		282,014		26,163		518,808
Cost-Plus Fee	104,365		—		73,621		177,986		112,479		—		94,320		206,799		79,741		755		102,726		183,222
Time-and-Materials	1,661		90,603		11,766		104,030		712		73,297		9,839		83,848		332		67,360		2,450		70,142
Segment Revenues	$	1,622,598	$	407,082	$	123,538	2,153,218		$	1,646,257	$	371,269	$	136,493	2,154,019		$	1,428,587	$	352,640	$	131,339	1,912,566
Eliminations							(29,144)								(30,503)								(17,646)
Revenues							$	2,124,074							$	2,123,516							$	1,894,920

Performance Obligations

As we progress on our contracts and the underlying performance obligations for which we recognize revenue over time, we refine our estimates of variable consideration and total estimated costs at completion, which impact the overall profitability on our contracts and performance obligations. Changes in these estimates result in the recognition of cumulative catch-up adjustments that impact our revenues and/or costs of contracts. During the years ended December 31, 2021, 2020 and 2019, we recognized net favorable changes in estimates that resulted in increases in revenues of $30.7 million, $44.9 million and $70.9 million, respectively, as well as increases (decreases) in cost of operations of $4.2 million, $2.1 million and $(0.7) million, respectively.

Contract Assets and Liabilities

We include revenues and related costs incurred, plus accumulated contract costs that exceed amounts invoiced to customers under the terms of the contracts, in Contracts in progress. We include in Advance billings on contracts billings that exceed accumulated contract costs and revenues and costs recognized over time. Amounts that are withheld on our fixed-price incentive fee contracts are classified within Retainages. Certain of these amounts require conditions other than the passage of time to be achieved, with the remaining amounts only requiring the passage of time. Most long-term contracts contain provisions for progress payments. Our unbilled receivables do not contain an allowance for credit losses as we expect to invoice customers and collect all amounts for unbilled receivables. Changes in Contracts in progress and Advance billings on contracts are primarily driven by differences in the timing of revenue recognition and billings to our customers. During the year ended December 31, 2021, our unbilled receivables increased $92.4 million primarily as a result of fixed-price incentive fee contracts within our Nuclear Operations Group segment and the timing of milestone billings on certain firm-fixed-price contracts within our Nuclear Power Group segment. During the year ended December 31, 2021, our Advance billings on contracts increased $28.0 million primarily as a result of billings in excess of revenue recognized on certain firm-fixed-price contracts within our Nuclear Operations Group segment. Our fixed-price incentive fee contracts for our Nuclear Operations Group segment include provisions that result in an increase in retainages on contracts during the first and third quarters of the year, with larger payments made during the second and fourth quarters. Retainages also vary as a result of timing differences between incurring costs and achieving milestones that allow us to recover these amounts.


	December 31,		December 31,
	2021		2020
	(In thousands)
Included in Contracts in progress:
Unbilled receivables	$	528,644	$	436,279
Retainages	$	51,507	$	55,172
Included in Other Assets:
Retainages	$	1,271	$	1,488
Advance billings on contracts	$	111,619	$	83,581

Retainages expected to be collected after one year are included in Other Assets. Of the long-term retainages at December 31, 2021, we anticipate collecting $0.3 million in 2023 and $1.0 million in 2024.

During the years ended December 31, 2021 and 2020, we recognized $67.5 million and $51.5 million of revenue that was in Advance billings on contracts at the beginning of each year, respectively.

Remaining Performance Obligations

Remaining performance obligations represent the dollar amount of revenue we expect to recognize in the future from performance obligations on contracts previously awarded and in progress. Of the remaining performance obligations on our contracts with customers at December 31, 2021, we expect to recognize revenues as follows:


	2022		2023		Thereafter		Total
	(In approximate millions)
Nuclear Operations Group	$	1,573	$	1,102	$	1,836	$	4,511
Nuclear Power Group	260		142		242		644
Nuclear Services Group	21		—		—		21
Total Remaining Performance Obligations	$	1,854	$	1,244	$	2,078	$	5,176

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045

+ Details

Equity Method Investments

12 Months Ended

Dec. 31, 2021

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments

EQUITY METHOD INVESTMENTS

We have investments in entities that we account for using the equity method. Our share of the undistributed earnings of our equity method investees were $39.4 million and $26.6 million at December 31, 2021 and 2020, respectively. These amounts are included in Investments in Unconsolidated Affiliates on our consolidated balance sheets.

The following tables summarize combined balance sheet and income statement information for investments accounted for under the equity method:


	December 31,
	2021		2020
	(In thousands)
Current assets	$	546,233	$	492,025
Noncurrent assets	634		970
Total Assets	$	546,867	$	492,995
Current liabilities	$	284,821	$	270,536
Owners' equity	262,046		222,459
Total Liabilities and Owners' Equity	$	546,867	$	492,995


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Revenues	$	4,254,635	$	3,980,066	$	3,716,548
Gross profit	$	159,935	$	142,709	$	133,170
Net income	$	156,994	$	139,988	$	130,949

Reimbursable costs recorded in revenues by the unconsolidated joint ventures in our Nuclear Services Group segment totaled $4,102.9 million, $3,851.5 million and $3,516.1 million for the years ended December 31, 2021, 2020 and 2019, respectively.

Income taxes for the investees are the responsibility of the respective owners. Accordingly, no provision for income taxes has been recorded by the investees.

Reconciliations of net income per combined income statement information of our investees to equity in income of investees per our consolidated statements of income are as follows:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Equity income based on stated ownership percentages	$	31,870	$	27,266	$	28,272
Timing of GAAP and other adjustments	1,628		(114)		652
Equity in income of investees	$	33,498	$	27,152	$	28,924

Our transactions with unconsolidated affiliates were as follows:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Sales to	$	11,838	$	12,186	$	14,668
Dividends received	$	20,475	$	25,005	$	20,955
Capital contributions, net of returns	$	—	$	(88)	$	(255)

At December 31, 2021 and 2020, Accounts receivable - other included amounts due from unconsolidated affiliates of $1.6 million and $2.5 million, respectively.

Income Taxes

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

We are subject to federal income tax in the U.S. and Canada as well as income tax within multiple U.S. state jurisdictions. We provide for income taxes based on the enacted tax laws and rates in the jurisdictions in which we conduct our operations. These jurisdictions may have regimes of taxation that vary with respect to nominal rates and with respect to the basis on which these rates are applied. This variation, along with the changes in our mix of income within these jurisdictions, can contribute to shifts in our effective tax rate from period to period.

We are currently under audit by various state authorities. With few exceptions, we do not have any returns under examination for years prior to 2017.

We apply the provisions of FASB Topic Income Taxes regarding the treatment of uncertain tax positions. A reconciliation of unrecognized tax benefits (exclusive of interest and federal and state benefits) is as follows:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Balance at beginning of period	$	5,852	$	3,899	$	274
Increases based on tax positions taken in the current year	964		2,075		3,736
Increases based on tax positions taken in the prior years	—		—		—
Decreases based on tax positions taken in the prior years	—		—		—
Decreases due to settlements with tax authorities	(6,775)		—		—
Decreases due to lapse of applicable statute of limitation	(41)		(123)		(127)
Other, net	—		1		16
Balance at end of period	$	—	$	5,852	$	3,899

Deferred income taxes reflect the net tax effects of temporary differences between the financial and tax bases of assets and liabilities. Significant components of deferred tax assets and liabilities as of December 31, 2021 and 2020 were as follows:


	December 31,
	2021		2020
	(In thousands)
Deferred tax assets:
Pension liability	$	12,047	$	31,152
Accrued warranty expense	1,363		1,338
Accrued vacation pay	7,633		7,442
Accrued liabilities for self-insurance (including postretirement health care benefits)	2,095		2,602
Accrued liabilities for executive and employee incentive compensation	10,733		13,312
Environmental and products liabilities	21,050		20,261
Lease liabilities	3,667		2,155
Investments in joint ventures and affiliated companies	2,283		1,148
Long-term contracts	21,562		15,974
Accrued payroll taxes	4,753		4,828
U.S. federal tax credits and loss carryforward	7,023		7,224
U.S. state tax credits and loss carryforward	4,866		6,819
Foreign tax credit and loss carryforward	16,477		9,919
Other	2,568		4,961
Total deferred tax assets	118,120		129,135
Valuation allowance for deferred tax assets	(13,218)		(12,892)
Deferred tax assets	104,902		116,243
Deferred tax liabilities:
Property, plant and equipment	66,636		39,315
Right-of-use lease assets	11,666		10,509
Intangibles	16,365		17,004

Total deferred tax liabilities	94,667		66,828
Net deferred tax assets	$	10,235	$	49,415

The components of Income before Provision for Income Taxes were as follows:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
U.S.	$	343,091	$	314,150	$	270,569
Other than U.S.	52,622		48,022		43,173
Income before Provision for Income Taxes	$	395,713	$	362,172	$	313,742

The components of Provision for Income Taxes were as follows:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Current:
U.S. – federal	$	31,535	$	53,340	$	47,693
U.S. – state and local	1,030		7,587		2,180
Other than U.S.	16,769		14,159		15,398
Total current	49,334		75,086		65,271
Deferred:
U.S. – federal	40,463		10,852		7,975
U.S. – state and local	3,473		(536)		872
Other than U.S.	(3,845)		(2,426)		(5,053)
Total deferred	40,091		7,890		3,794
Provision for Income Taxes	$	89,425	$	82,976	$	69,065

The following is a reconciliation of our income tax provision from the U.S. statutory federal tax rate to our consolidated effective tax rate:


	Year Ended December 31,
	2021		2020		2019
U.S. federal statutory tax rate	21.0	%	21.0	%	21.0	%
State and local income taxes	1.1	%	1.9	%	1.0	%
Foreign rate differential	0.6	%	0.6	%	0.6	%
Excess tax deductions on equity compensation	(0.1)	%	(0.3)	%	(0.7)	%



Other	—	%	(0.3)	%	0.1	%
Effective tax rate	22.6	%	22.9	%	22.0	%

At December 31, 2021, we had a valuation allowance of $13.2 million for deferred tax assets, which we expect cannot be realized through carrybacks, future reversals of existing taxable temporary differences and our estimate of future taxable income. We believe that our remaining deferred tax assets are more likely than not realizable through carrybacks, future reversals of existing taxable temporary differences, our estimate of future taxable income and potential tax planning. Any changes to our estimated valuation allowance could be material to our consolidated financial statements.

The following is an analysis of our valuation allowance for deferred tax assets:


	Beginning Balance		Charges To Costs and Expenses	Charged To Other Accounts	Ending Balance
	(In thousands)
Year Ended December 31, 2021	$	(12,892)	(326)	—	$	(13,218)
Year Ended December 31, 2020	$	(13,578)	771	(85)	$	(12,892)
Year Ended December 31, 2019	$	(13,257)	(414)	93	$	(13,578)

We have domestic federal and foreign capital losses of $9.3 million available to offset future capital gains. The domestic federal capital losses begin to expire in 2023, while the foreign capital losses have an indefinite carryforward period. We are carrying a full valuation allowance of $9.3 million against the deferred tax asset related to these domestic federal and foreign capital loss carryforwards.

In addition, we have state credits and state net operating losses of $6.1 million ($4.9 million net of federal tax benefit) available to offset future taxable income in various states. These state net operating loss carryforwards begin to expire in 2022. We are carrying a valuation allowance of $4.9 million ($3.9 million net of federal tax benefit) against the deferred tax asset related to the state credits and state loss carryforwards.

We would be subject to withholding taxes if we were to distribute earnings from certain foreign subsidiaries. As of December 31, 2021, the undistributed earnings of these subsidiaries were approximately $248.9 million, and our unrecognized deferred income tax liabilities of approximately $12.4 million would be payable upon the distribution of these earnings. All of our foreign earnings are considered indefinitely reinvested.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32857-109319

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 17
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32809-109319

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32705-109319

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Long-Term Debt

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Long-Term Debt

LONG-TERM DEBT

Our Long-Term Debt consists of the following:


	December 31,
	2021		2020
	(In thousands)
Debt Instruments:
Senior Notes	$	800,000	$	800,000
Credit Facility	400,000		75,000

Long-Term Debt, gross	1,200,000		875,000
Less: Deferred debt issuance costs	10,696		12,269
Long-Term Debt	$	1,189,304	$	862,731

Maturities of Long-Term Debt subsequent to December 31, 2021 were as follows: 2022 through 2024 – $0.0 million; 2025 – $400.0 million; 2026 – $0.0 million; and thereafter – $800.0 million.

Credit Facility

On March 24, 2020, we entered into an Amendment No. 1 to Credit Agreement, which amended the Credit Agreement dated as of May 24, 2018 (as amended, the "Credit Facility") with Wells Fargo Bank, N.A., as administrative agent, and the other lenders party thereto. The Credit Facility provides for a $750 million senior secured revolving credit facility (the "Revolving Credit Facility"). All obligations under the Revolving Credit Facility are scheduled to mature on March 24, 2025. The proceeds of loans under the Revolving Credit Facility are available for working capital needs, permitted acquisitions and other general corporate purposes.

The Credit Facility allows for additional parties to become lenders and, subject to certain conditions, for the increase of the commitments under the Credit Facility, subject to an aggregate maximum for all additional commitments of (1) the greater of (a) $250 million and (b) 65% of EBITDA, as defined in the Credit Facility, for the last four full fiscal quarters, plus (2) all voluntary prepayments of the term loans, plus (3) additional amounts provided the Company is in compliance with a pro forma first lien leverage ratio test of less than or equal to 2.50 to 1.00.

The Company's obligations under the Credit Facility are guaranteed, subject to certain exceptions, by substantially all of the Company's present and future wholly owned domestic restricted subsidiaries. The Credit Facility is secured by first-priority liens on certain assets owned by the Company and its subsidiary guarantors (other than its subsidiaries comprising its Nuclear Operations Group segment and a portion of its Nuclear Services Group segment).

The Revolving Credit Facility requires interest payments on revolving loans on a periodic basis until maturity. We may prepay all loans under the Credit Facility at any time without premium or penalty (other than customary Eurocurrency breakage costs), subject to notice requirements.

The Credit Facility includes financial covenants that are tested on a quarterly basis, based on the rolling four-quarter period that ends on the last day of each fiscal quarter. The maximum permitted leverage ratio is 4.00 to 1.00, which may be increased to 4.50 to 1.00 for up to four consecutive fiscal quarters after a material acquisition. The minimum consolidated interest coverage ratio is 3.00 to 1.00. In addition, the Credit Facility contains various restrictive covenants, including with respect to debt, liens, investments, mergers, acquisitions, dividends, equity repurchases and asset sales. As of December 31, 2021, we were in compliance with all covenants set forth in the Credit Facility.

Outstanding loans under the Revolving Credit Facility bear interest at our option at either (1) the Eurocurrency rate plus a margin ranging from 1.0% to 1.75% per year or (2) the base rate plus a margin ranging from 0.0% to 0.75% per year. We are charged a commitment fee on the unused portion of the Revolving Credit Facility, and that fee ranges from 0.15% to 0.225% per year. Additionally, we are charged a letter of credit fee of between 1.0% and 1.75% per year with respect to the amount of each financial letter of credit issued under the Credit Facility, and a letter of credit fee of between 0.75% and 1.05% per year

with respect to the amount of each performance letter of credit issued under the Credit Facility. The applicable margin for loans, the commitment fee and the letter of credit fees set forth above will vary quarterly based on our leverage ratio. Based on the leverage ratio applicable at December 31, 2021, the margin for Eurocurrency rate and base rate revolving loans was 1.50% and 0.50%, respectively, the letter of credit fee for financial letters of credit and performance letters of credit was 1.50% and 0.90%, respectively, and the commitment fee for the unused portion of the Revolving Credit Facility was 0.20%.

As of December 31, 2021, borrowings and letters of credit issued under the Revolving Credit Facility totaled $400.0 million and $36.2 million, respectively. As a result, as of December 31, 2021 we had $313.8 million available under the Revolving Credit Facility for borrowings and to meet letter of credit requirements. As of December 31, 2021, the interest rate on outstanding borrowings under our Credit Facility was 1.61%.

The Credit Facility generally includes customary events of default for a secured credit facility. Under the Credit Facility, (1) if an event of default relating to bankruptcy or other insolvency events occurs with respect to the Company, all related obligations will immediately become due and payable; (2) if any other event of default exists, the lenders will be permitted to accelerate the maturity of the related obligations outstanding; and (3) if any event of default exists, the lenders will be permitted to terminate their commitments thereunder and exercise other rights and remedies, including the commencement of foreclosure or other actions against the collateral.

If any default occurs under the Credit Facility, or if we are unable to make any of the representations and warranties in the Credit Facility, we will be unable to borrow funds or have letters of credit issued under the Credit Facility.

Senior Notes due 2026

We issued $400 million aggregate principal amount of 5.375% senior notes due 2026 (the "Senior Notes due 2026") pursuant to an indenture dated May 24, 2018, among the Company, certain of our subsidiaries, as guarantors, and U.S. Bank National Association, as trustee. On July 15, 2021, using cash on hand and borrowings under the Credit Facility, we redeemed the Senior Notes due 2026 at a redemption price equal to 102.688% of the principal amount, resulting in an early redemption premium of $10.8 million and the write-off of deferred debt issuance costs totaling $4.2 million. These charges were recorded in our consolidated statement of income during the year ended December 31, 2021 as components of Other – net and Interest expense, respectively.

Senior Notes due 2028

We issued $400 million aggregate principal amount of 4.125% senior notes due 2028 (the "Senior Notes due 2028") pursuant to an indenture dated June 12, 2020 (the "2020 Indenture"), among the Company, certain of our subsidiaries, as guarantors, and U.S. Bank Trust Company, National Association (formerly known as U.S. Bank National Association) ("U.S. Bank"), as trustee. The Senior Notes due 2028 are guaranteed by each of the Company's present and future direct and indirect wholly owned domestic subsidiaries that is a guarantor under the Credit Facility.

Interest on the Senior Notes due 2028 is payable semi-annually in cash in arrears on June 30 and December 30 of each year at a rate of 4.125% per annum. The Senior Notes due 2028 will mature on June 30, 2028.

We may redeem the Senior Notes due 2028, in whole or in part, at any time on or after June 30, 2023 at a redemption price equal to (i) 102.063% of the principal amount to be redeemed if the redemption occurs during the twelve-month period beginning on June 30, 2023, (ii) 101.031% of the principal amount to be redeemed if the redemption occurs during the twelve-month period beginning on June 30, 2024 and (iii) 100.0% of the principal amount to be redeemed if the redemption occurs on or after June 30, 2025, in each case plus accrued and unpaid interest, if any, to, but excluding, the redemption date. At any time prior to June 30, 2023, we may also redeem up to 40.0% of the Senior Notes due 2028 with net cash proceeds of certain equity offerings at a redemption price equal to 104.125% of the principal amount of the Senior Notes due 2028 to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. In addition, at any time prior to June 30, 2023, we may redeem the Senior Notes due 2028, in whole or in part, at a redemption price equal to 100.0% of the principal amount of the Senior Notes due 2028 to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date plus an applicable "make-whole" premium.

The 2020 Indenture contains customary events of default, including, among other things, payment default, failure to comply with covenants or agreements contained in the 2020 Indenture or the Senior Notes due 2028 and certain provisions related to bankruptcy events. The 2020 Indenture also contains customary negative covenants. As of December 31, 2021, we were in compliance with all covenants set forth in the 2020 Indenture and the Senior Notes due 2028.

Senior Notes due 2029

We issued $400 million aggregate principal amount of 4.125% senior notes due 2029 (the "Senior Notes due 2029") pursuant to an indenture dated April 13, 2021 (the "2021 Indenture"), among the Company, certain of our subsidiaries, as guarantors, and U.S. Bank, as trustee. The Senior Notes due 2029 are guaranteed by each of the Company's present and future direct and indirect wholly owned domestic subsidiaries that is a guarantor under the Credit Facility.

Interest on the Senior Notes due 2029 is payable semi-annually in cash in arrears on April 15 and October 15 of each year at a rate of 4.125% per annum. The Senior Notes due 2029 will mature on April 15, 2029.

We may redeem the Senior Notes due 2029, in whole or in part, at any time on or after April 15, 2024 at a redemption price equal to (i) 102.063% of the principal amount to be redeemed if the redemption occurs during the twelve-month period beginning on April 15, 2024, (ii) 101.031% of the principal amount to be redeemed if the redemption occurs during the twelve-month period beginning on April 15, 2025 and (iii) 100.0% of the principal amount to be redeemed if the redemption occurs on or after April 15, 2026, in each case plus accrued and unpaid interest, if any, to, but excluding, the redemption date. At any time prior to April 15, 2024, we may also redeem up to 40.0% of the Senior Notes due 2029 with net cash proceeds of certain equity offerings at a redemption price equal to 104.125% of the principal amount of the Senior Notes due 2029 to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. In addition, at any time prior to April 15, 2024, we may redeem the Senior Notes due 2029, in whole or in part, at a redemption price equal to 100.0% of the principal amount of the Senior Notes due 2029 to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date plus an applicable "make-whole" premium.

The 2021 Indenture contains customary events of default, including, among other things, payment default, failure to comply with covenants or agreements contained in the 2021 Indenture or the Senior Notes due 2029 and certain provisions related to bankruptcy events. The 2021 Indenture also contains customary negative covenants. As of December 31, 2021, we were in compliance with all covenants set forth in the 2021 Indenture and the Senior Notes due 2029.

Other Arrangements

We have posted surety bonds to support regulatory and contractual obligations for certain decommissioning responsibilities, projects and legal matters. We utilize bonding facilities to support such obligations, but the issuance of bonds under those facilities is typically at the surety's discretion, and the bonding facilities generally permit the surety, in its sole discretion, to terminate the facility or demand collateral. Although there can be no assurance that we will maintain our surety bonding capacity, we believe our current capacity is adequate to support our existing requirements for the next twelve months. In addition, these bonds generally indemnify the beneficiaries should we fail to perform our obligations under the applicable agreements. We, and certain of our subsidiaries, have jointly executed general agreements of indemnity in favor of surety underwriters relating to surety bonds those underwriters issue. As of December 31, 2021, bonds issued and outstanding under these arrangements totaled approximately $109.5 million.

Pension Plans and Postretirement Benefits

12 Months Ended

Dec. 31, 2021

Retirement Benefits [Abstract]

Pension Plans and Postretirement Benefits

PENSION PLANS AND POSTRETIREMENT BENEFITS

We have historically provided defined benefit retirement benefits, primarily through noncontributory pension plans, for most of our regular employees. Certain of our subsidiaries have made other benefits available to certain groups of employees, including postretirement health care and life insurance benefits. For salaried employees, all major U.S. and Canadian defined benefit retirement plans have been closed to new entrants, and benefit accruals have ceased. For hourly employees, certain defined benefit retirement plans have been closed to new entrants.

Our funding policy is to fund the plans as recommended by the respective plan actuaries and in accordance with the Employee Retirement Income Security Act of 1974, as amended, or other applicable law. Assuming we continue as a government contractor, our contractual arrangements with the U.S. Government provide for the recovery of contributions to our pension and other postretirement benefit plans covering employees working primarily in our Nuclear Operations Group segment.

Obligations and Funded Status


	Pension Benefits Year Ended December 31,				Other Benefits Year Ended December 31,
	2021		2020		2021		2020
	(In thousands)
Change in benefit obligation:
Benefit obligation at beginning of period	$	1,414,055	$	1,308,798	$	61,086	$	58,881
Service cost	11,667		10,650		760		642
Interest cost	27,170		37,199		1,197		1,612
Plan participants' contributions	199		180		488		562
Amendments	2,314		2,333		3,402		—

Settlements	(38,330)		(7,041)		—		—
Actuarial loss (gain)	(45,476)		120,126		(4,944)		2,219

Foreign currency exchange rate changes	1,669		3,513		197		331
Benefits paid	(65,002)		(61,703)		(2,885)		(3,161)
Benefit obligation at end of period	$	1,308,266	$	1,414,055	$	59,301	$	61,086
Change in plan assets:
Fair value of plan assets at beginning of period	$	1,281,232	$	1,150,495	$	52,077	$	48,321
Actual return on plan assets	72,030		190,862		2,898		5,293
Plan participants' contributions	199		180		488		562
Company contributions	6,164		5,131		1,008		992
Settlements	(39,439)		(7,041)		—		—

Foreign currency exchange rate changes	1,615		3,308		—		—
Benefits paid	(65,002)		(61,703)		(2,959)		(3,091)
Fair value of plan assets at the end of period	1,256,799		1,281,232		53,512		52,077
Funded status	$	(51,467)	$	(132,823)	$	(5,789)	$	(9,009)
Amounts recognized in the balance sheet consist of:
Prepaid postretirement benefit obligation	$	—	$	—	$	20,122	$	18,069
Prepaid pension	10,573		14,588		—		—
Accrued employee benefits	(3,125)		(3,082)		(1,578)		(1,389)
Accumulated postretirement benefit obligation	—		—		(24,333)		(25,689)
Pension liability	(58,915)		(144,329)		—		—
Accrued benefit liability, net	$	(51,467)	$	(132,823)	$	(5,789)	$	(9,009)
Amount recognized in accumulated comprehensive income (before taxes):
Prior service cost (credit)	$	20,536	$	21,319	$	2,520	$	(1,059)
Supplemental information:
Plans with accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	$	1,172,881	$	1,264,764	N/A		N/A
Accumulated benefit obligation	$	1,166,855	$	1,255,899	$	23,503	$	24,593
Fair value of plan assets	$	1,110,841	$	1,117,353	$	—	$	—
Plans with plan assets in excess of accumulated benefit obligation:
Projected benefit obligation	$	135,385	$	149,291	N/A		N/A
Accumulated benefit obligation	$	135,375	$	149,270	$	35,798	$	36,493
Fair value of plan assets	$	145,958	$	163,879	$	53,512	$	52,077

We record the service cost component of net periodic benefit cost within Operating income on our consolidated statements of income. For the years ended December 31, 2021, 2020 and 2019, these amounts were $12.4 million, $11.3 million and $9.7 million, respectively. All other components of net periodic benefit cost are included in Other – net on our consolidated statements of income. For the years ended December 31, 2021, 2020 and 2019, these amounts were $(92.9) million, $(31.6) million and $(17.5) million, respectively. Components of net periodic benefit cost included in net income are as follows:


	Pension Benefits Year Ended December 31,						Other Benefits Year Ended December 31,
	2021		2020		2019		2021		2020		2019
	(In thousands)
Components of net periodic benefit cost:
Service cost	$	11,667	$	10,650	$	9,123	$	760	$	642	$	545
Interest cost	27,170		37,199		46,307		1,197		1,612		2,254
Expected return on plan assets	(81,778)		(77,298)		(69,809)		(2,891)		(2,691)		(2,514)
Amortization of prior service cost	3,097		3,370		2,903		(178)		(193)		(311)
Recognized net actuarial loss (gain)	(34,690)		6,829		9,353		(4,876)		(458)		(5,723)
Net periodic benefit cost (income)	$	(74,534)	$	(19,250)	$	(2,123)	$	(5,988)	$	(1,088)	$	(5,749)

Net periodic benefit cost related to our pension plans is calculated in accordance with GAAP. In addition, we calculate pension costs in accordance with U.S. cost accounting standards ("CAS") for purposes of cost recovery on our U.S. Government contracts to the extent applicable. See further discussion of CAS pension costs under the heading "Critical Accounting Estimates" in Item 7 of this Annual Report on Form 10-K.

Recognized net actuarial losses (gains) consist primarily of our reported actuarial losses (gains), settlements, and the differences between the actual returns on plan assets and the expected returns on plan assets. The benefit obligation of our pension plans as of December 31, 2021 and 2020 increased (decreased) by $(43.0) million and $124.2 million, respectively, due to changes in the discount rate.

In December 2021, we purchased a group annuity contract that transferred certain foreign hourly pension benefit obligations of approximately $38.3 million to an insurance company for approximately 400 retirees. As a result, we recognized pension settlement-related charges of $1.1 million during the year ended December 31, 2021.

Additional Information


	Pension Benefits Year Ended December 31,				Other Benefits Year Ended December 31,
	2021		2020		2021		2020
	(In thousands)
Decrease in accumulated other comprehensive income due to actuarial losses – before taxes	$	(2,314)	$	(2,333)	$	(3,402)	$	—

In the current fiscal year, we have recognized expense (income) in other comprehensive income as a component of net periodic benefit cost of approximately $3.1 million and $(0.2) million for our pension benefits and other benefits, respectively.

Assumptions


	Pension Benefits				Other Benefits
	2021		2020		2021		2020
Weighted-average assumptions used to determine net periodic benefit obligations at December 31:
Discount rate	2.91	%	2.63	%	2.85	%	2.49	%


	Pension Benefits						Other Benefits
	2021		2020		2019		2021		2020		2019
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31:
Discount rate to determine interest cost	1.96	%	2.78	%	3.98	%	1.87	%	2.62	%	3.92	%
Expected return on plan assets	6.80	%	6.95	%	6.95	%	5.66	%	5.66	%	5.68	%

The expected return on plan assets rate assumptions are based on the long-term expected returns for the investment mix of assets in the portfolio. In setting these rates, we use a building-block approach. Historical real return trends for the various asset classes in the plan's portfolio are combined with anticipated future market conditions to estimate the real rate of return for each asset class. These rates are then adjusted for anticipated future inflation to estimate nominal rates of return for each asset class. The expected rate of return on plan assets is then determined to be the weighted-average nominal return based on the weightings of the asset classes within the total asset portfolio.

Our existing other benefit plans are unfunded, with the exception of the NFS postretirement benefit plans. These plans provide health benefits to certain salaried and hourly employees, as well as retired employees, of NFS. All of the assets for these postretirement benefit plans are contributed into a Voluntary Employees' Beneficiary Association trust.


	2021		2020
Assumed health care cost trend rates at December 31:
Health care cost trend rate assumed for next year	7.50	%	6.75	%
Rates to which the cost trend rate is assumed to decline (ultimate trend rate)	4.50	%	4.50	%
Year that the rate reaches ultimate trend rate	2034		2030

Investment Goals

General

The overall investment strategy of the pension trusts is to achieve long-term growth of principal, while avoiding excessive risk and to minimize the probability of loss of principal over the long term. The specific investment goals that have been set for the pension trusts, in the aggregate, are (1) to ensure that plan liabilities are met when due and (2) to achieve an investment return on trust assets consistent with a reasonable level of risk.

Allocations to each asset class for both domestic and foreign plans are reviewed periodically and rebalanced, if appropriate, to assure the continued relevance of the goals, objectives and strategies. The pension trusts for both our domestic and foreign plans employ a professional investment advisor and a number of professional investment managers whose individual benchmarks are, in the aggregate, consistent with the plan's overall investment objectives.

The goals of each investment manager are (1) to meet (in the case of passive accounts) or exceed (for actively managed accounts) the benchmark selected and agreed upon by the manager and the pension trust and (2) to display an overall level of risk in its portfolio that is consistent with the risk associated with the agreed upon benchmark.

The investment performance of total portfolios, as well as asset class components, is periodically measured against commonly accepted benchmarks, including the individual investment manager benchmarks. In evaluating investment manager performance, consideration is also given to personnel, strategy, research capabilities, organizational and business matters, adherence to discipline and other qualitative factors that may impact the ability to achieve desired investment results.

Domestic Plans

We sponsor the following domestic defined benefit pension plans:

•BWXT Retirement Plan;

•Nuclear Fuel Services, Inc. Retirement Plan for Salaried Employees; and

•Nuclear Fuel Services, Inc. Retirement Plan for Hourly Employees.

The assets of the domestic pension plans are commingled for investment purposes and held by the trustee in the BWXT Master Trust (the "Master Trust"). For the years ended December 31, 2021 and 2020, the investment returns on domestic plan assets of the Master Trust (net of deductions for management fees) were approximately 9% and 19%, respectively.

The following is a summary of the asset allocations for the Master Trust at December 31, 2021 and 2020 by asset category:


	December 31,
	2021		2020
Asset Category:
Commingled and Mutual Funds	29	%	29	%
U.S. Government Securities	32	%	28	%
Fixed Income (excluding U.S. Government Securities)	11	%	18	%
Diversified Credit	11	%	11	%
Real Estate	11	%	7	%
Partnerships with Security Holdings	4	%	4	%
Other	2	%	3	%
Total	100	%	100	%

The target allocation for 2022 for the domestic plans, by asset class, is as follows:


Asset Class:
Fixed Income	45	%
Equities	28	%
Other	27	%

Foreign Plans

We sponsor various plans through certain of our Canadian subsidiaries.

The combined weighted-average asset allocations of these plans at December 31, 2021 and 2020 by asset category were as follows:


	December 31,
	2021		2020
Asset Category:
Fixed Income	20	%	98	%
Commingled and Mutual Funds	11	%	—	%
Cash and Other	69	%	2	%
Total	100	%	100	%

The target allocation for 2022 for the Canadian plans, by asset class, is as follows:


Asset Class:
Fixed Income	20	%
Equities	11	%
Cash and Other	69	%

Fair Value

See Note 14 for a detailed description of fair value measurements and the hierarchy established for valuation inputs. The following is a summary of total assets for our plans measured at fair value at December 31, 2021:


	12/31/2021		Level 1		Level 2		Level 3		Unclassified
	(In thousands)
Pension and Other Benefits:
U.S. Government Securities	$	369,980	$	365,295	$	4,685	$	—	$	—
Commingled and Mutual Funds	358,423		77,680		—		—		280,743
Fixed Income	182,169		31,856		128,829		—		21,484
Diversified Credit	133,508		—		—		—		133,508
Real Estate	126,886		—		—		—		126,886
Investment Contract (1)	46,817		—		—		46,817		—
Partnerships with Security Holdings	46,515		—		—		—		46,515
Cash, Cash Equivalents and Accrued Items (2)	46,013		—		—		—		46,013
Total Assets	$	1,310,311	$	474,831	$	133,514	$	46,817	$	655,149

(1)During 2021, we filed for regulatory approval for the windup of our foreign salaried pension benefit plan. Based on those participants who elected to receive annuities upon retirement, we purchased a group annuity contract totaling $45.6 million.

(2)Includes items that are not required to be categorized in the fair value hierarchy in order to permit reconciliation of the fair value hierarchy to the fair value of plan assets presented in the Obligations and Funded Status table.

The following is a summary of total assets for our plans measured at fair value at December 31, 2020:


	12/31/2020		Level 1		Level 2		Level 3		Unclassified
	(In thousands)
Pension and Other Benefits:
Fixed Income	$	391,418	$	—	$	228,857	$	—	$	162,561
Commingled and Mutual Funds	338,473		72,764		—		—		265,709
U.S. Government Securities	316,375		310,975		5,400		—		—
Diversified Credit	126,823		—		—		—		126,823
Real Estate	77,437		—		—		—		77,437
Partnerships with Security Holdings	49,007		—		—		—		49,007
Cash, Cash Equivalents and Accrued Items (1)	33,776		—		—		—		33,776
Total Assets	$	1,333,309	$	383,739	$	234,257	$	—	$	715,313

(1)Includes items that are not required to be categorized in the fair value hierarchy in order to permit reconciliation of the fair value hierarchy to the fair value of plan assets presented in the Obligations and Funded Status table.

The following is a summary of the changes in the Plans' Level 3 instruments for the year ended December 31, 2021:


	Year Ended December 31,
	2021
	(In thousands)
Balance at beginning of period	$	—
Purchases	45,645
Unrealized gain	652
Translation	520
Balance at end of period	$	46,817

Cash Flows


	Domestic Plans				Foreign Plans
	Pension Benefits		Other Benefits		Pension Benefits		Other Benefits
	(In thousands)
Expected employer contributions to trusts of defined benefit plans:
2022	$	—	$	90	$	10,579	N/A
Expected benefit payments:
2022	$	61,599	$	2,924	$	3,588	$	526
2023	$	63,669	$	2,914	$	3,802	$	547
2024	$	65,271	$	2,959	$	4,009	$	557
2025	$	66,406	$	2,914	$	4,212	$	586
2026	$	67,253	$	2,855	$	4,390	$	639
2027-2031	$	337,288	$	12,881	$	24,724	$	3,404

Defined Contribution Plans

We also provide benefits under the BWXT Thrift Plan (the "Thrift Plan"). The Thrift Plan generally provides for matching employer contributions of 50% of the first 6% of compensation, as defined in the Thrift Plan, contributed by participants, and fully vest and are nonforfeitable after three years of service or upon retirement, death, lay-off or approved disability. These matching employer contributions are made in cash and invested at the employees' discretion. We also provide service-based cash contributions under the Thrift Plan to employees not accruing benefits under our defined benefit plans. Our Canadian plans also include a defined contribution component whereby we make cash, service-based contributions. Amounts charged to expense for employer contributions under our defined contribution plans totaled approximately $37.5 million, $35.8 million and $31.7 million in the years ended December 31, 2021, 2020 and 2019, respectively.

- Definition

The entire disclosure for retirement benefits.

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+ Details

Capital Stock	12 Months Ended
Capital Stock	Dec. 31, 2021
Equity [Abstract]
Capital Stock	CAPITAL STOCK On November 6, 2018, our Board of Directors authorized an additional share repurchase of up to an aggregate market value of $250 million during a three-year period from November 6, 2018 to November 6, 2021. This authorization became fully utilized in September 2021. On April 30, 2021, our Board of Directors authorized us to repurchase an indeterminate number of shares of our common stock at an aggregate market value of up to $500 million with no expiration date. In the year ended December 31, 2021, we repurchased 4,134,767 shares of our common stock for $225.8 million. In the year ended December 31, 2020, we repurchased 338,521 shares of our common stock for $22.0 million. In the year ended December 31, 2019, we repurchased 443,877 shares of our common stock for $20.0 million. As of December 31, 2021, we had approximately $417.6 million available to us for share repurchase under the $500 million authorization described above.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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+ Details

Stock-Based Compensation

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Stock-Based Compensation

STOCK-BASED COMPENSATION

BWX Technologies, Inc. 2020 Omnibus Incentive Plan

In May 2020, our stockholders approved the 2020 Omnibus Incentive Plan (the "2020 Plan") which succeeded the 2010 Long-Term Incentive Plan of BWX Technologies, Inc. (the "2010 Plan"). Members of the Board of Directors, executive officers, key employees and consultants are eligible to participate in the 2020 Plan. The Compensation Committee of the Board of Directors selects the participants for the 2020 Plan. The 2020 Plan provides for cash awards and equity-based compensation in the form of stock options, restricted stock, restricted stock units, performance shares and performance units, subject to satisfaction of specific performance goals. Shares subject to awards under either the 2020 Plan or the 2010 Plan that are cancelled, forfeited, terminated or expire unexercised, shall immediately become available for the granting of awards under the 2020 Plan. As of the effective date of the 2020 Plan, shares available for grant under the 2010 Plan are available for grant under the 2020 Plan. In addition, our stockholders approved an additional 1,450,000 shares of common stock for issuance through the 2020 Plan. Options to purchase shares are granted at not less than 100% of the fair market value closing price on the date of grant, become exercisable at such time or times as determined when granted and expire not more than ten years after the date of grant.

At December 31, 2021, we had a total of 4,036,598 shares of our common stock available for future awards. In the event of a change in control of the Company, the terms of the awards under the 2020 Plan contain provisions that may cause restrictions to lapse and accelerate the vesting of awards.

2010 Long-Term Incentive Plan of BWX Technologies, Inc.

Members of the Board of Directors, executive officers, key employees and consultants were eligible to participate in the 2010 Plan prior to it being succeeded by the 2020 Plan. The Compensation Committee of the Board of Directors selected the participants for the 2010 Plan. The 2010 Plan provided for a number of forms of stock-based compensation, including incentive and non-qualified stock options, restricted stock, restricted stock units, performance shares and performance units, subject to satisfaction of specific performance goals. Shares subject to award under the 2010 Plan that are cancelled, forfeited, terminated or expire unexercised, shall immediately become available for the granting of awards under the 2020 Plan. As part of the approval of the 2010 Plan, 10,000,000 shares of common stock were initially authorized for issuance, with an additional 2,300,000 authorized for issuance in 2014. Options to purchase shares are granted at not less than 100% of the fair market value closing price on the date of grant, become exercisable at such time or times as determined when granted and expire not more than ten years after the date of grant.

Long-Term Incentive Plan of BWXT Technical Services Group, Inc.

In June 2012, we established the 2012 Long-Term Incentive Plan of BWXT Technical Services Group, Inc., a cash-settled plan for employees of certain subsidiaries and unconsolidated affiliates as selected by the plan committee. The cash-settled plan provides for a number of forms of stock-based compensation, including stock appreciation rights, restricted stock units and performance units, subject to satisfaction of specific performance goals. Stock appreciation rights are granted at not less than 100% of the fair market value closing price of a share of BWXT common stock on the date of grant, become exercisable at such time or times as determined when granted and expire not more than ten years after the date of grant. Stock appreciation rights are cash settled for the excess of the market price of BWXT common stock on the exercise date minus the exercise price. Restricted stock units and performance units are cash settled upon vesting as determined when granted. We will not issue any shares of BWXT common stock under this plan, as all awards are cash settled.

In the event of a change in control of the Company, the terms of the awards under the cash-settled plan contain provisions that may cause restrictions to lapse and accelerate the vesting of awards.

Stock-based compensation expense for all of our plans recognized for the years ended December 31, 2021, 2020 and 2019 totaled $18.3 million, $16.8 million and $14.8 million, respectively, with associated tax benefit totaling $3.0 million, $2.7 million and $2.5 million, respectively.

As of December 31, 2021, unrecognized estimated compensation expense related to nonvested awards was $14.8 million, which is expected to be recognized over a weighted-average period of 1.6 years.

Stock Options

The following table summarizes activity for our stock options for the year ended December 31, 2021 (share data in thousands):


	Number of Shares	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (In millions)
Outstanding at beginning of period	201	$	24.07
Granted	—	N/A
Exercised	(76)	$	24.77
Cancelled/expired/forfeited	—	N/A
Outstanding at end of period	125	$	23.65	3.2 years	$	3.0
Exercisable at end of period	125	$	23.65	3.2 years	$	3.0

The aggregate intrinsic value included in the table above represents the total pre-tax intrinsic value that would have been received by the option holders had all option holders exercised their options on December 31, 2021. The intrinsic value is calculated as the total number of option shares multiplied by the difference between the closing price of our common stock on the last trading day of the period and the exercise price of the options. This amount changes based on the price of our common stock.

During the years ended December 31, 2021, 2020 and 2019, the total intrinsic value of stock options exercised was $2.7 million, $4.7 million and $8.1 million, respectively. The actual tax benefits realized related to the stock options exercised during the year ended December 31, 2021 totaled $0.3 million.

Performance Shares

Nonvested performance shares as of December 31, 2021 and changes during the year ended December 31, 2021 were as follows (share data in thousands):


	Number of Shares	Weighted- Average Grant Date Fair Value
Nonvested at beginning of period	451	$	56.15
Adjustment to assumed vesting percentage	52	$	58.51
Granted	159	$	59.39
Vested	(104)	$	63.81
Cancelled/forfeited	(13)	$	56.23
Nonvested at end of period	545	$	55.90

The actual number of shares in which each participant vests is dependent upon achievement of certain return on invested capital and diluted earnings per share targets over a three-year performance period. The number of shares in which participants can vest ranges from zero to 200% of the initial performance shares granted, to be determined upon completion of the three-year performance period. The nonvested shares at the end of the period in the table above assumes weighted-average vesting of 129%.

The actual tax benefits realized related to the performance shares vested during the year ended December 31, 2021 totaled $1.0 million.

Restricted Stock Units

Nonvested restricted stock units as of December 31, 2021 and changes during the year ended December 31, 2021 were as follows (share data in thousands):


	Number of Shares	Weighted- Average Grant Date Fair Value
Nonvested at beginning of period	185	$	55.96
Granted	150	$	60.29
Vested	(107)	$	58.45
Cancelled/forfeited	(7)	$	57.09
Nonvested at end of period	221	$	57.66

The actual tax benefits realized related to the restricted stock units vested during the year ended December 31, 2021 totaled $1.1 million.

Cash-Settled Stock Appreciation Rights

The following table summarizes activity for our stock appreciation rights for the year ended December 31, 2021 (unit data in thousands):


	Number of Units	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (In millions)
Outstanding at beginning of period	40	$	24.04
Granted	—	N/A
Exercised	(13)	$	24.97
Cancelled/expired/forfeited	—	N/A
Outstanding at end of period	27	$	23.62	3.2 years	$	0.7
Exercisable at end of period	27	$	23.62	3.2 years	$	0.7

The aggregate intrinsic value included in the table above represents the total pre-tax intrinsic value that would have been received by the stock appreciation rights holders had all holders exercised their rights on December 31, 2021. The intrinsic value is calculated as the total number of stock appreciation rights multiplied by the difference between the closing price of our common stock on the last trading day of the period and the exercise price of the stock appreciation rights. This amount changes based on the price of our common stock.

Cash-Settled Performance Units

The actual number of units in which each participant vests is dependent upon achievement of certain return on invested capital and diluted earnings per share targets over a three-year performance period. The number of units in which participants can vest ranges from zero to 200% of the initial performance units granted, to be determined upon completion of the three-year performance period.

As of December 31, 2021, we had 3,973 nonvested units valued at $47.88 per share with an assumed weighted-average vesting of 128%. The fair value is based on our closing stock price as of December 31, 2021 and is re-determined at the end of each reporting period for purposes of remeasuring compensation expense associated with these cash-settled awards.

Cash-Settled Restricted Stock Units

As of December 31, 2021, we had 1,715 nonvested units valued at $47.88 per share. The fair value is based on our closing stock price as of December 31, 2021 and is re-determined at the end of each reporting period for purposes of remeasuring compensation expense associated with these cash-settled awards.

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Investigations and Litigation Due to the nature of our business, we are, from time to time, involved in investigations, litigation, disputes or claims related to our business activities, including, among other things: •performance- or warranty-related matters under our customer and supplier contracts and other business arrangements; and •workers' compensation, employment, premises liability and other claims. Based upon our prior experience, we do not expect that any of these litigation proceedings, disputes and claims will have a material adverse effect on our consolidated financial condition, results of operations or cash flows. Environmental Matters We have been identified as a potentially responsible party at various cleanup sites under the Comprehensive Environmental Response, Compensation, and Liability Act, as amended ("CERCLA") and other environmental laws. These laws can impose liability for the entire cost of cleanup on any of the potentially responsible parties, regardless of fault or the lawfulness of the original conduct. Generally, however, where there are multiple responsible parties, a final allocation of costs is made based on the amount and type of wastes disposed of by each party and the number of financially viable parties, although this may not be the case with respect to any particular site. We have not been determined to be a major contributor of wastes to any of these sites. On the basis of the relative contribution of waste to each site by potentially responsible parties, as well as the financial solvency of other potentially responsible parties, we expect our share of the ultimate liability for the various sites will not have a material adverse effect on our consolidated financial condition, results of operations or cash flows in any given year. We perform significant amounts of work for the U.S. Government under both prime contracts and subcontracts and operate certain facilities that are licensed to possess and process special nuclear materials. As a result of these activities, we are subject to continuing reviews by governmental agencies, including the U.S. Environmental Protection Agency and the NRC. We are also involved in manufacturing activities at licensed facilities in Canada that are subject to continuing reviews by governmental agencies in Canada, including the CNSC. The NRC's decommissioning regulations require our Nuclear Operations Group segment to provide financial assurance that it will be able to pay the expected cost of decommissioning its two licensed facilities at the end of their service lives. We provided financial assurance totaling $61.8 million during the years ended December 31, 2021 and 2020 with surety bonds for the ultimate decommissioning of these licensed facilities. These facilities have provisions in their government contracts pursuant to which substantially all of our decommissioning costs and financial assurance obligations are covered by the DOE, including the costs to complete the decommissioning projects underway at the facility in Erwin, Tennessee. The surety bonds noted above are to cover decommissioning required pursuant to work not subject to this DOE obligation. In Canada, the CNSC's decommissioning regulations require our Nuclear Power Group segment to provide financial assurance that it will be able to pay the expected cost of decommissioning its CNSC-licensed facilities at the end of their service lives. We provided financial assurance totaling $46.4 million and $47.9 million during the years ended December 31, 2021 and 2020, respectively, with letters of credit and surety bonds for the ultimate decommissioning of these licensed facilities. Our compliance with federal, foreign, state and local environmental control and protection regulations resulted in pre-tax charges of approximately $17.5 million, $16.3 million and $15.9 million in the years ended December 31, 2021, 2020 and 2019, respectively. In addition, compliance with existing environmental regulations necessitated capital expenditures of $3.1 million, $1.2 million and $1.4 million in the years ended December 31, 2021, 2020 and 2019, respectively. At December 31, 2021 and 2020, we had total environmental accruals (including asset retirement obligations) of $102.4 million and $91.3 million, respectively. Of our total environmental accruals at December 31, 2021 and 2020, $9.8 million and $7.1 million, respectively, were included in current liabilities. Inherent in the estimates of these accruals are our expectations regarding the levels of contamination, decommissioning costs and recoverability from other parties, which may vary significantly as decommissioning activities progress. Accordingly, changes in estimates could result in material adjustments to our operating results, and the ultimate loss may differ materially from the amounts that we have provided for in our consolidated financial statements.

Risks and Uncertainties	12 Months Ended
Risks and Uncertainties	Dec. 31, 2021
Risks and Uncertainties [Abstract]
Risks and Uncertainties	RISKS AND UNCERTAINTIES Revenue Recognized Over Time As of December 31, 2021, in accordance with the method of recognizing revenue over time, we have provided for our estimated costs to complete all of our ongoing contracts. However, it is possible that current estimates could change due to unforeseen events, which could result in adjustments to overall contract costs. The risk on fixed-price contracts is that revenue from the customer does not cover increases in our costs. It is possible that current estimates could materially change for various reasons, including, but not limited to, fluctuations in forecasted labor productivity or steel and other raw material prices. Increases in costs on our fixed-price contracts could have a material adverse impact on our consolidated financial condition, results of operations and cash flows. Alternatively, reductions in overall contract costs at completion could materially improve our consolidated financial condition, results of operations and cash flows. Insurance Upon the February 22, 2006 effectiveness of the settlement relating to the Chapter 11 proceedings involving several of our former subsidiaries, most of our subsidiaries contributed substantial insurance rights to the asbestos personal injury trust, including rights to (1) certain pre-1979 primary and excess insurance coverages and (2) certain of our 1979-1986 excess insurance coverage. These insurance rights provided coverage for, among other things, asbestos and other personal injury claims, subject to the terms and conditions of the policies. The contribution of these insurance rights was made in exchange for the agreement on the part of the representatives of the asbestos claimants, including the representative of future claimants, to the entry of a permanent injunction, pursuant to Section 524(g) of the U.S. Bankruptcy Code, to channel to the asbestos trust all asbestos-related general liability claims against our subsidiaries and former subsidiaries arising out of, resulting from or attributable to their operations, and the implementation of related releases and indemnification provisions protecting those subsidiaries and their affiliates from future liability for such claims. Although we are not aware of any significant, unresolved claims against our subsidiaries and former subsidiaries that are not subject to the channeling injunction and that relate to the periods during which such excess insurance coverage related, with the contribution of these insurance rights to the asbestos personal injury trust, it is possible that we could have underinsured or uninsured exposure for non-derivative asbestos claims or other personal injury or other claims that would have been insured under these coverages had the insurance rights not been contributed to the asbestos personal injury trust. In conjunction with the spin-off, claims and liabilities associated with the asbestos personal injury, property damage and indirect property damage claims mentioned above have been expressly assumed by BWE pursuant to the master separation agreement between us and BWE.

Financial Instruments with Concentrations of Credit Risk	12 Months Ended
	Dec. 31, 2021
Risks and Uncertainties [Abstract]
Financial Instruments with Concentrations of Credit Risk	FINANCIAL INSTRUMENTS WITH CONCENTRATIONS OF CREDIT RISK The primary customer of our Nuclear Operations Group and Nuclear Services Group segments is the U.S. Government, including some of its contractors. Our Nuclear Power Group segment's major customers are large utilities. These concentrations of customers may impact our overall exposure to credit risk, either positively or negatively, in that our customers may be similarly affected by changes in economic or other conditions. In the years ended December 31, 2021, 2020 and 2019, U.S. Government contracts accounted for approximately 76%, 77% and 77% of our total consolidated revenues, respectively. Accounts receivable due directly or indirectly from the U.S. Government represented 68% and 83% of net receivables at December 31, 2021 and 2020, respectively. See Note 15 and Note 3 for additional information about our operations in different geographic areas. We believe that our provision for possible losses on uncollectable accounts receivable is adequate for our credit loss exposure. At December 31, 2021 and 2020, the allowances for possible losses that we deducted from Accounts receivable – trade, net on our consolidated balance sheets were $0.2 million.

Investments

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Investments

INVESTMENTS

The following is a summary of our investments at December 31, 2021:


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(In thousands)
Equity securities

Mutual funds	$	6,001	$	1,649	$	—	$	7,650
Available-for-sale securities
U.S. Government and agency securities	2,742		—		(4)		2,738
Corporate bonds	2,559		374		(7)		2,926
Asset-backed securities and collateralized mortgage obligations	107		—		(52)		55
Total	$	11,409	$	2,023	$	(63)	$	13,369

The following is a summary of our investments at December 31, 2020:


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(In thousands)
Equity securities
Equities	$	172	$	628	$	—	$	800
Mutual funds	5,323		1,432		—		6,755
Available-for-sale securities
U.S. Government and agency securities	2,317		1		(4)		2,314
Corporate bonds	2,879		259		(6)		3,132
Asset-backed securities and collateralized mortgage obligations	115		—		(53)		62
Total	$	10,806	$	2,320	$	(63)	$	13,063

Fair Value Measurements

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

FASB Topic Fair Value Measurements and Disclosures defines fair value as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. This topic also sets forth the disclosure requirements regarding fair value and establishes a hierarchy for valuation inputs that emphasizes the use of observable inputs when measuring fair value. A financial instrument's categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The fair value hierarchy established by this topic is as follows:

•Level 1 – inputs are based upon quoted prices for identical instruments traded in active markets.

•Level 2 – inputs are based upon quoted prices for similar instruments in active markets, quoted prices for similar or identical instruments in inactive markets and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets and liabilities.

•Level 3 – inputs are generally unobservable and typically reflect management's estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques that include option pricing models, discounted cash flow models and similar valuation techniques.

In accordance with FASB Topic Fair Value Measurements, certain investments that were measured at net asset value per share (or its equivalent) ("NAV") have not been classified in the fair value hierarchy. These investments are measured on the fair value of the underlying investments but may not be redeemable at that fair value. When appropriate, we adjust these net asset values for contributions and distributions, if any, made during the period beginning on the latest NAV valuation date and ending on our measurement date. We also consider available market data, relevant index returns, preliminary estimates from

our investees and other data obtained through research and consultation with third-party advisors in determining the fair value of these investments.

The following sections describe the valuation methodologies we use to measure the fair values of our investments, derivatives and nonrecurring fair value measurements.

Investments

Investments primarily include U.S. Government securities, corporate bonds and equities and mutual funds.

In general, and where applicable, we principally use a composite of observable prices and quoted prices in active markets for identical assets or liabilities to determine fair value. This pricing methodology applies to our Level 1 and Level 2 investments.

Fair Value Measurements

The following is a summary of our investments measured at fair value at December 31, 2021:


	12/31/2021		Level 1		Level 2		Level 3		Unclassified
	(In thousands)
Equity securities

Mutual funds	$	7,650	$	—	$	7,650	$	—	$	—
Available-for-sale securities
U.S. Government and agency securities	2,738		2,738		—		—		—
Corporate bonds	2,926		1,852		1,074		—		—
Asset-backed securities and collateralized mortgage obligations	55		—		55		—		—
Total	$	13,369	$	4,590	$	8,779	$	—	$	—

The following is a summary of our investments measured at fair value at December 31, 2020:


	12/31/2020		Level 1		Level 2		Level 3		Unclassified
	(In thousands)
Equity securities
Equities	$	800	$	—	$	—	$	800	$	—
Mutual funds	6,755		—		6,755		—		—
Available-for-sale securities
U.S. Government and agency securities	2,314		2,314		—		—		—
Corporate bonds	3,132		1,738		1,394		—		—
Asset-backed securities and collateralized mortgage obligations	62		—		62		—		—
Total	$	13,063	$	4,052	$	8,211	$	800	$	—

Derivatives

Level 2 derivative assets and liabilities currently consist of FX forward contracts. Where applicable, the value of these derivative assets and liabilities is computed by discounting the projected future cash flow amounts to present value using market-based observable inputs, including FX forward and spot rates, interest rates and counterparty performance risk adjustments. At December 31, 2021 and 2020, we had FX forward contracts outstanding to purchase or sell foreign currencies, primarily Canadian dollars and Euros, with a total fair value of $(3.2) million and $(2.2) million, respectively.

Other Financial Instruments

We used the following methods and assumptions in estimating our fair value disclosures for our other financial instruments:

Cash and cash equivalents and restricted cash and cash equivalents. The carrying amounts that we have reported in the accompanying consolidated balance sheets for Cash and cash equivalents and Restricted cash and cash equivalents approximate their fair values due to their highly liquid nature.

Long-term and short-term debt. We base the fair values of debt instruments, including our Senior Notes, on quoted market prices. Where quoted prices are not available, we base the fair values on the present value of future cash flows discounted at estimated borrowing rates for similar debt instruments or on estimated prices based on current yields for debt issues of similar quality and terms. At December 31, 2020, the fair value of our Senior Notes due 2026 was $415.5 million. At December 31, 2021 and 2020, the fair value of our Senior Notes due 2028 was $406.3 million and $416.7 million, respectively. At December 31, 2021, the fair value of our Senior Notes due 2029 was $406.5 million. The fair value of our remaining debt instruments approximated their carrying values at December 31, 2021 and 2020.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Segment Reporting

12 Months Ended

Dec. 31, 2021

Segment Reporting [Abstract]

Segment Reporting

SEGMENT REPORTINGAs described in Note 1, our operations are assessed based on three reportable segments. The operations of our segments are managed separately, and each segment has unique technology, services and customer classes. We account for intersegment

sales at prices that we generally establish by reference to similar transactions with unaffiliated customers. Reportable segments are measured based on operating income exclusive of general corporate expenses and gains (losses) on sales of corporate assets.

1. Information about Operations in our Different Industry Segments:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
REVENUES:
Nuclear Operations Group	$	1,622,598	$	1,646,257	$	1,428,587
Nuclear Power Group	407,082		371,269		352,640
Nuclear Services Group	123,538		136,493		131,339
Eliminations (1)	(29,144)		(30,503)		(17,646)
	$	2,124,074	$	2,123,516	$	1,894,920

(1)Segment revenues are net of the following intersegment transfers:


Nuclear Operations Group Transfers	$	(5,402)	$	(3,791)	$	(4,382)
Nuclear Power Group Transfers	(778)		(553)		(208)
Nuclear Services Group Transfers	(22,964)		(26,159)		(13,056)
	$	(29,144)	$	(30,503)	$	(17,646)


OPERATING INCOME:
Nuclear Operations Group	$	308,645	$	326,049	$	298,328
Nuclear Power Group	52,548		51,989		53,815
Nuclear Services Group	27,932		26,436		14,226
Other	(24,333)		(22,309)		(23,099)
	$	364,792	$	382,165	$	343,270
Unallocated Corporate (1)	(18,944)		(23,613)		(17,749)
Total Operating Income (2)	$	345,848	$	358,552	$	325,521
Other Income (Expense)	49,865		3,620		(11,779)
Income before Provision for Income Taxes	$	395,713	$	362,172	$	313,742

(1)Unallocated Corporate includes general corporate overhead not allocated to segments.

(2)The following amounts are included in Operating Income:


Losses (Gains) on Asset Disposals and Impairments, Net:
Nuclear Operations Group	$	(8)	$	(8)	$	(6)
Nuclear Power Group	(2,548)		(1,681)		103
Nuclear Services Group	—		328		2,727
Other	—		—		—
Unallocated Corporate	(976)		—		—
	$	(3,532)	$	(1,361)	$	2,824
Equity in Income of Investees:
Nuclear Operations Group	$	—	$	—	$	—
Nuclear Power Group	—		—		—
Nuclear Services Group	33,498		27,152		28,924
Other	—		—		—
	$	33,498	$	27,152	$	28,924


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
CAPITAL EXPENDITURES:
Nuclear Operations Group	$	143,945	$	135,637	$	133,279
Nuclear Power Group	153,571		106,596		38,053
Nuclear Services Group	2,940		1,326		1,169
Other	166		252		2,597
Segment Capital Expenditures	300,622		243,811		175,098
Corporate Capital Expenditures	10,430		11,216		7,026
Total Capital Expenditures	$	311,052	$	255,027	$	182,124
DEPRECIATION AND AMORTIZATION:
Nuclear Operations Group	$	40,514	$	33,174	$	33,231
Nuclear Power Group	19,774		18,325		17,054
Nuclear Services Group	1,005		1,685		3,246
Other	1,076		645		787
Segment Depreciation and Amortization	62,369		53,829		54,318
Corporate Depreciation and Amortization	6,711		6,845		7,404
Total Depreciation and Amortization	$	69,080	$	60,674	$	61,722


	December 31,
	2021		2020		2019
	(In thousands)
SEGMENT ASSETS:
Nuclear Operations Group	$	1,243,766	$	1,184,741	$	986,827
Nuclear Power Group	974,372		828,729		580,413
Nuclear Services Group	186,249		166,240		177,952
Other	2,858		3,638		3,751
Segment Assets	2,407,245		2,183,348		1,748,943
Corporate Assets	94,135		110,155		159,970
Total Assets	$	2,501,380	$	2,293,503	$	1,908,913
INVESTMENT IN UNCONSOLIDATED AFFILIATES:
Nuclear Operations Group	$	—	$	—	$	—
Nuclear Power Group	—		—		—
Nuclear Services Group	85,284		71,806		70,116
Other	—		—		—
Total Investment in Unconsolidated Affiliates	$	85,284	$	71,806	$	70,116

2. Information about our Product and Service Lines:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
REVENUES:
Nuclear Operations Group:
Government Programs	$	1,527,704	$	1,540,256	$	1,368,555
Commercial Operations	94,894		106,001		60,032
	1,622,598		1,646,257		1,428,587
Nuclear Power Group:
Nuclear Manufacturing	246,444		250,585		243,472
Nuclear Services and Engineering	160,638		120,684		109,168
	407,082		371,269		352,640
Nuclear Services Group:
Nuclear Environmental Services	77,514		94,320		102,726
Nuclear Services and Advanced Reactor Design and Engineering	46,024		42,173		28,613
	123,538		136,493		131,339

Eliminations	(29,144)		(30,503)		(17,646)
	$	2,124,074	$	2,123,516	$	1,894,920

3. Information about our Consolidated Operations in Different Geographic Areas:


	December 31,
	2021		2020		2019
	(In thousands)
NET PROPERTY, PLANT AND EQUIPMENT:
U.S.	$	698,772	$	603,518	$	494,202
Canada	346,868		212,953		86,039
	$	1,045,640	$	816,471	$	580,241

See Note 3 for revenues by geographic area for each of our segments.

4. Information about our Major Customers:

In the years ended December 31, 2021, 2020 and 2019, sales to the U.S. Government accounted for approximately 76%, 77% and 77% of our total consolidated revenues, respectively, all of which were included in our Nuclear Operations Group and Nuclear Services Group segments.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2021

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data (Unaudited)

QUARTERLY FINANCIAL DATA (UNAUDITED)

The following tables set forth selected unaudited quarterly financial information for the years ended December 31, 2021 and 2020:


	Year Ended December 31, 2021 Quarter Ended
	March 31, 2021		June 30, 2021		September 30, 2021		December 31, 2021
	(In thousands, except per share amounts)
Revenues	$	528,273	$	505,099	$	498,727	$	591,975
Operating income (1)	$	82,414	$	73,751	$	87,468	$	102,215
Equity in income of investees	$	8,316	$	7,263	$	10,618	$	7,301
Net Income Attributable to BWX Technologies, Inc.	$	69,749	$	59,347	$	59,914	$	116,861
Earnings per common share:
Basic:
Net Income Attributable to BWX Technologies, Inc.	$	0.73	$	0.62	$	0.64	$	1.27
Diluted:
Net Income Attributable to BWX Technologies, Inc.	$	0.73	$	0.62	$	0.63	$	1.26

(1)Includes equity in income of investees.


	Year Ended December 31, 2020 Quarter Ended
	March 31, 2020		June 30, 2020		September 30, 2020		December 31, 2020
	(In thousands, except per share amounts)
Revenues	$	542,208	$	504,520	$	519,878	$	556,910
Operating income (1)	$	98,267	$	82,434	$	88,770	$	89,081
Equity in income of investees	$	6,063	$	4,913	$	8,271	$	7,905
Net Income Attributable to BWX Technologies, Inc.	$	75,499	$	64,258	$	73,171	$	65,742
Earnings per common share:
Basic:
Net Income Attributable to BWX Technologies, Inc.	$	0.79	$	0.67	$	0.77	$	0.69
Diluted:
Net Income Attributable to BWX Technologies, Inc.	$	0.79	$	0.67	$	0.76	$	0.69

(1)Includes equity in income of investees.

In the quarter ended September 30, 2021, we recognized an early redemption premium of $10.8 million and wrote-off deferred debt issuance costs totaling $4.2 million.

We immediately recognize actuarial gains (losses) for our pension and postretirement benefit plans in earnings as a component of net periodic benefit cost. Recorded in the quarters ended December 31, 2021 and 2020, the effects of these adjustments on pre-tax income were $39.6 million and $(6.4) million, respectively.

Earnings Per Share

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Earnings Per Share

EARNINGS PER SHARE

The following table sets forth the computation of basic and diluted earnings per share:


	Year Ended December 31,
	2021		2020		2019
	(In thousands, except shares and per share amounts)
Basic:
Net Income Attributable to BWX Technologies, Inc.	$	305,871	$	278,670	$	244,115
Weighted-average common shares	94,278,894		95,457,193		95,377,414
Basic earnings per common share	$	3.24	$	2.92	$	2.56
Diluted:
Net Income Attributable to BWX Technologies, Inc.	$	305,871	$	278,670	$	244,115
Weighted-average common shares (basic)	94,278,894		95,457,193		95,377,414
Effect of dilutive securities:
Stock options, restricted stock units and performance shares (1)	239,528		269,304		433,124
Adjusted weighted-average common shares	94,518,422		95,726,497		95,810,538
Diluted earnings per common share	$	3.24	$	2.91	$	2.55

(1)At December 31, 2021, 2020 and 2019, none of our shares were antidilutive.

Basis of Presentation and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Spin-off	On June 30, 2015, we completed the spin-off of our former Power Generation business (the "spin-off") into an independent, publicly traded company named Babcock & Wilcox Enterprises, Inc. ("BWE").
Reportable Segments	Reportable Segments We operate in three reportable segments: Nuclear Operations Group, Nuclear Power Group and Nuclear Services Group. Our reportable segments are further described as follows: •Our Nuclear Operations Group segment manufactures naval nuclear reactors for the U.S. Naval Nuclear Propulsion Program for use in submarines and aircraft carriers. Through this segment, we own and operate manufacturing facilities located in Lynchburg, Virginia; Barberton, Ohio; Mount Vernon, Indiana; Euclid, Ohio; and Erwin, Tennessee. The Lynchburg operations fabricate fuel-bearing precision components that range in weight from a few grams to hundreds of tons. In-house capabilities also include wet chemistry uranium processing, advanced heat treatment to optimize component material properties and a controlled, clean-room environment with the capacity to assemble railcar-size components. The Barberton and Mount Vernon locations specialize in the design and manufacture of heavy components inclusive of fabrication activities for submarine missile launch tubes. The Euclid facility fabricates electro-mechanical equipment and performs design, manufacturing, inspection, assembly and testing activities. Fuel for the naval nuclear reactors is provided by Nuclear Fuel Services, Inc. ("NFS"), one of our wholly owned subsidiaries. Located in Erwin, NFS also downblends Cold War-era government stockpiles of high-enriched uranium. •Our Nuclear Power Group segment fabricates commercial nuclear steam generators, nuclear fuel, fuel handling systems, pressure vessels, reactor components, heat exchangers, tooling delivery systems and other auxiliary equipment, including containers for the storage of spent nuclear fuel and other high-level waste and supplies nuclear-grade materials and precisely machined components for nuclear utility customers. BWXT has supplied the nuclear industry with more than 1,300 large, heavy components worldwide and is the only commercial heavy nuclear component manufacturer in North America. This segment also provides specialized engineering services that include structural component design, 3-D thermal-hydraulic engineering analysis, weld and robotic process development, electrical and controls engineering and metallurgy and materials engineering. In addition, this segment offers in-plant inspection, maintenance and modification services for nuclear steam generators, heat exchangers, reactors, fuel handling systems and balance of plant equipment, as well as specialized non-destructive examination and tooling/repair solutions. This segment is also a leading global manufacturer and supplier of critical medical radioisotopes and radiopharmaceuticals for research, diagnostic and therapeutic uses. •Our Nuclear Services Group segment provides various services to the U.S. Government including nuclear materials management and operation, environmental management and administrative and operating services for various U.S. Government-owned facilities. These services are provided to the U.S. Department of Energy ("DOE"), including the National Nuclear Security Administration ("NNSA"), the Office of Nuclear Energy, the Office of Science and the Office of Environmental Management, and NASA. Through this segment we deliver services and management solutions to nuclear and high-consequence operations. A significant portion of this segment's operations is conducted through joint ventures. This segment also develops technology for a variety of applications, including advanced nuclear power sources, and offers complete advanced nuclear fuel and reactor design and engineering, licensing and manufacturing services for new advanced nuclear reactors.
Use of Estimates	Use of Estimates We use estimates and assumptions to prepare our financial statements in conformity with GAAP. Some of our more significant estimates include estimates of costs to complete long-term contracts and the associated revenues, estimates of the fair value of acquired intangible and other assets, estimates we make in selecting assumptions related to the valuations of our pension and postretirement benefit plans, including the selection of our discount rates, mortality and expected rates of return on our pension plan assets and estimates we make in evaluating our asset retirement obligations. These estimates and assumptions affect the amounts we report in our financial statements and accompanying notes. Our actual results could differ from these estimates. Variances could result in a material effect on our financial condition and results of operations in future periods.
Contracts and Revenue Recognition	Contracts and Revenue Recognition We generally recognize contract revenues and related costs over time for individual performance obligations based on a cost-to-cost method in accordance with FASB Topic Revenue from Contracts with Customers. We recognize estimated contract revenue and resulting income based on the measurement of the extent of progress toward completion as a percentage of the total project. Certain costs may be excluded from the cost-to-cost method of measuring progress, such as significant costs for uninstalled materials, if such costs do not depict our performance in transferring control of goods or services to the customer. We review contract price and cost estimates periodically as the work progresses and reflect adjustments proportionate to the percentage-of-completion in income in the period when those estimates are revised. Certain of our contracts recognize revenue at a point in time, and revenue on these contracts is recognized when control transfers to the customer. The majority of our revenue that is recognized at a point in time is related to parts and certain medical radioisotopes and radiopharmaceuticals in our Nuclear Power Group segment. For all contracts, if a current estimate of total contract cost indicates a loss on a contract, the projected loss is recognized in full when determined.
Warranty Expense	Warranty Expense We accrue estimated warranty expense, included in Cost of operations on our consolidated statements of income, to satisfy contractual warranty requirements when we recognize the associated revenue on the related contracts. In addition, we record specific provisions or reductions where we expect the actual warranty costs to significantly differ from the accrued estimates. Such changes could have a material effect on our consolidated financial condition, results of operations and cash flows.
Stock-Based Compensation	Stock-Based Compensation We expense stock-based compensation in accordance with FASB Topic Compensation – Stock Compensation. Under this topic, the fair value of equity-classified awards, such as restricted stock, performance shares and stock options, is determined on the date of grant and is not remeasured. The fair value of liability-classified awards, such as cash-settled stock appreciation rights, restricted stock units and performance units, is determined on the date of grant and is remeasured at the end of each reporting period through the date of settlement. Grant date fair values for restricted stock, restricted stock units, performance shares and performance units are determined using the closing price of our common stock on the date of grant. Under the provisions of this FASB topic, we recognize expense for all share-based awards granted on a straight-line basis over the requisite service periods of the awards, which is generally equivalent to the vesting term. This topic requires compensation expense to be recognized such that compensation expense is recorded only for those awards expected to vest. As a result, we periodically review the amount of actual forfeitures and record any adjustments deemed necessary each reporting period. We also recognize excess tax benefits in our provision for income taxes. These excess tax benefits result from tax deductions in excess of the cumulative compensation expense recognized for options exercised and other equity-classified awards.
Grant Accounting	Grant Accounting We recognize amounts related to grants as a reduction of expense in the period in which the related costs for which the grants are intended to compensate are recognized and we are reasonably assured to receive payment.
Research and Development	Research and Development Our research and development activities are related to the development and improvement of new and existing products and equipment, as well as conceptual and engineering evaluation for translation into practical applications. We charge the costs of research and development unrelated to specific contracts as incurred. Contractual arrangements for customer-sponsored research and development can vary on a case-by-case basis.
Capitalization of Interest Cost	Capitalization of Interest CostWe capitalize interest in accordance with FASB Topic Interest.
Income Taxes	Income Taxes Income tax expense for federal, foreign, state and local income taxes is calculated on pre-tax income based on current tax law and includes the cumulative effect of any changes in tax rates from those used previously in determining deferred tax assets and liabilities. We record a valuation allowance to reduce our deferred tax assets to the amount that is more likely than not to be realized. We assess deferred taxes and the adequacy of the valuation allowance on a quarterly basis. In the ordinary course of business, there is inherent uncertainty in quantifying our income tax positions. We assess our income tax positions and record tax benefits for all years subject to examination based upon management's evaluation of the facts, circumstances and information available at the reporting date. For those tax positions where it is more likely than not that a tax benefit will be sustained, we have recorded the largest amount of tax benefit with a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is not more likely than not that a tax benefit will be sustained, no tax benefit has been recognized in the financial statements. We record interest and penalties (net of any applicable tax benefit) related to income taxes as a component of Provision for Income Taxes on our consolidated statements of income. We would be subject to withholding taxes if we were to distribute earnings from certain foreign subsidiaries, and unrecognized deferred income tax liabilities, including withholding taxes, would be payable upon distribution of these earnings. We consider the earnings of our non-U.S. subsidiaries to be permanently reinvested.
Earnings Per Share	Earnings Per Share We have computed earnings per common share on the basis of the weighted-average number of common shares, and, where dilutive, common share equivalents, outstanding during the indicated periods. We issue a number of forms of stock-based compensation periodically, including incentive and non-qualified stock options, restricted stock, restricted stock units, performance shares and performance units, subject to satisfaction of specific performance goals. We include the shares applicable to these plans in our computation of diluted earnings per share when related performance criteria have been met.
Cash and Cash Equivalents and Restricted Cash	Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Our cash equivalents are highly liquid investments with maturities of three months or less when we purchase them. We record cash and cash equivalents as restricted when we are unable to freely use such cash and cash equivalents for our general operating purposes.
Investments	Investments Our investment portfolio consists primarily of U.S. Government securities, corporate bonds and equities and mutual funds. Our debt securities are carried at fair value and are either classified as trading, with unrealized gains and losses reported in earnings, or as available-for-sale, with the unrealized gains and losses, net of tax, reported as a component of Accumulated other comprehensive income. Our equity securities are carried at fair value with the unrealized gains and losses reported in earnings. We classify investments available for current operations in the consolidated balance sheets as current assets, while we classify investments held for long-term purposes as non-current assets. We adjust the amortized cost of debt securities for amortization of premiums and accretion of discounts to maturity, and such adjustments are included in Interest income. We include realized gains and losses on our investments in Other – net. The cost of securities sold is based on the specific identification method. We include interest on investments in Interest income.
Inventories	InventoriesWe carry our inventory at the lower of cost or net realizable value using either the weighted average or first-in, first-out methods.
Property, Plant and Equipment	Property, Plant and Equipment We carry our property, plant and equipment at depreciated cost, less any impairment provisions. We depreciate our property, plant and equipment using the straight-line method over estimated economic useful lives of eight to 40 years for buildings and three to 14 years for machinery and equipment. Our depreciation expense was $58.1 million, $50.3 million and $51.0 million for the years ended December 31, 2021, 2020 and 2019, respectively. We expense the costs of maintenance, repairs and renewals that do not materially prolong the useful life of an asset as we incur them.
Goodwill	Goodwill Goodwill represents the excess of the cost of our acquired businesses over the fair value of the net assets acquired. We perform testing of goodwill for impairment annually or more frequently whenever events or circumstances indicate the carrying value of goodwill may be impaired. We may elect to perform a qualitative test when we believe that there is sufficient excess fair value over carrying value based on our most recent quantitative assessment, adjusted for relevant events and circumstances that could affect fair value during the current year. If we conclude based on this assessment that it is more likely than not that the reporting unit is not impaired, we do not perform a quantitative impairment test. In all other circumstances, we compare the fair value of a reporting unit to its carrying amount, including goodwill. If the fair value of the reporting unit exceeds its carrying value, no impairment charge is recorded. If the carrying amount of a reporting unit exceeds its fair value, an impairment charge is recorded to goodwill in the amount by which carrying value exceeds fair value.
Investments in Unconsolidated Affiliates	Investments in Unconsolidated Affiliates We use the equity method of accounting for affiliates in which we are able to exert significant influence. Currently, all of our material investments in affiliates that are not consolidated are recorded using the equity method. Affiliates in which we are unable to exert significant influence are carried at fair value.
Intangible Assets	Intangible AssetsIntangible assets are recognized at fair value when acquired. Intangible assets with definite lives are amortized to Costs and Expenses using the straight-line method over their estimated useful lives and tested for impairment when events or changes in circumstances indicate that their carrying amounts may not be recoverable. Intangible assets with indefinite lives are not amortized and are subject to annual impairment testing. We may elect to perform a qualitative assessment when testing indefinite-lived intangible assets for impairment to determine whether events or circumstances affecting significant inputs related to the most recent quantitative evaluation have occurred, indicating that it is more likely than not that the indefinite-lived intangible asset is impaired. Otherwise, we test indefinite-lived intangible assets for impairment by quantitatively determining the fair value of the indefinite-lived intangible asset and comparing the fair value of the intangible asset to its carrying amount. If the carrying amount of the intangible asset exceeds its fair value, we recognize impairment for the amount of the difference.
Leases	Leases We lease certain manufacturing facilities, office space and equipment under operating leases with terms of one to 20 years. Certain of the leases include options to renew for periods of one to 10 years. We include lease options in our determination of the right-of-use asset and lease liability if it is reasonably certain that we will exercise one or more of the options. Leases with initial terms of 12 months or less are excluded from our right-of-use assets and lease liabilities. Our right-of-use assets are included in Other Assets on our consolidated balance sheets. Our current lease liabilities are included in Accrued liabilities – other, and our noncurrent lease liabilities are included in Other Liabilities on our consolidated balance sheets. We use discount rates based on our incremental borrowing rate as most of our leases do not provide an implicit rate that can be readily determined.
Deferred Debt Issuance Costs	Deferred Debt Issuance CostsWe have included deferred debt issuance costs in the consolidated balance sheets as a direct deduction from the carrying amount of our debt liability. We amortize deferred debt issuance costs as interest expense over the life of the related debt.
Pension Plans and Postretirement Benefits	Pension Plans and Postretirement Benefits We sponsor various defined benefit pension and postretirement benefit plans covering certain employees of our U.S. and Canadian subsidiaries. We utilize actuarial valuations to calculate the cost and benefit obligations of our pension and postretirement benefits. The actuarial valuations utilize significant assumptions in the determination of our benefit cost and obligations, including assumptions regarding discount rates, expected returns on plan assets, mortality and health care cost trends. We determine our discount rate based on a yield curve comprising rates of return on high-quality, fixed-income investments currently available and expected to be available during the period to maturity of our pension and postretirement benefit plan obligations. The expected rate of return on plan assets assumption is based on capital market assumptions of the long-term expected returns for the investment mix of assets currently in the portfolio. The expected rate of return on plan assets is determined to be the weighted-average of the nominal returns based on the weightings of the classes within the total asset portfolio. Expected health care cost trends represent expected annual rates of change in the cost of health care benefits and are estimated based on analysis of health care cost inflation. The components of benefit cost related to service cost, interest cost, expected return on plan assets and prior service cost amortization are recorded on a quarterly basis based on actuarial assumptions. In the fourth quarter of each year, or as interim remeasurements are required, we immediately recognize net actuarial gains and losses in earnings as a component of net periodic benefit cost. Recognized net actuarial gains and losses consist primarily of our reported actuarial gains and losses and the difference between the actual return on plan assets and the expected return on plan assets. We recognize the funded status of each plan as either an asset or a liability in the consolidated balance sheets. The funded status is the difference between the fair value of plan assets and the present value of its benefit obligation, determined on a plan-by-plan basis. Our pension plan assets can include assets that are difficult to value.
Asset Retirement Obligations and Environmental Clean-up Costs	Asset Retirement Obligations and Environmental Cleanup Costs We accrue for future decommissioning of our nuclear facilities that will permit the release of these facilities to unrestricted use at the end of each facility's service life, which is a requirement of our licenses from the U.S. Nuclear Regulatory Commission ("NRC") and the Canadian Nuclear Safety Commission ("CNSC"). In accordance with the FASB Topic Asset Retirement and Environmental Obligations, we record the fair value of a liability for an asset retirement obligation in the period in which it is incurred. When we initially record such a liability, we capitalize a cost by increasing the carrying amount of the related long-lived asset. When we acquire a business that has an asset retirement obligation, the asset retirement obligation is recognized at fair value without a corresponding increase to the related long-lived asset. Over time, the liability is accreted to its present value each period and the capitalized cost is depreciated over the useful life of the related asset. Upon settlement of a liability, we will settle the obligation for its recorded amount or incur a gain or loss. This topic applies to environmental liabilities associated with assets that we currently operate and are obligated to remove from service. For environmental liabilities associated with assets that we no longer operate, we have accrued amounts based on the estimated costs of cleanup activities for which we are responsible, net of any cost-sharing arrangements. We adjust the estimated costs as further information develops or circumstances change. Given the long-lived nature of these facilities, we are required to estimate retirement costs that will be incurred in the future, which may extend up to 40 years at the time the asset retirement obligation is established. Due to the significance of the remaining useful life of these facilities, the timing of retirement and future costs for material components of the asset retirement obligations, such as labor and waste disposal fees, could differ from our estimates. An exception to this accounting treatment relates to the work we perform for two facilities for which the U.S. Government is obligated to pay substantially all of the decommissioning costs. Substantially all of our asset retirement obligations relate to the remediation of our nuclear analytical laboratory and the NFS facility in our Nuclear Operations Group segment as well as certain facilities in our Nuclear Power Group segment.
Self-Insurance	Self-InsuranceWe have a wholly owned insurance subsidiary that provides employer's liability, general and automotive liability and primary workers' compensation insurance and, from time to time, builder's risk insurance (within certain limits) to our companies. We may also, in the future, have this insurance subsidiary accept other risks that we cannot or do not wish to transfer to outside insurance companies.
Loss Contingencies	Loss Contingencies We accrue liabilities for loss contingencies when it is probable that a liability has been incurred and the amount of loss is reasonably estimable. We provide disclosure when there is a reasonable possibility that the ultimate loss will exceed the recorded provision or if such probable loss is not reasonably estimable. Due to the nature of our business, we are, from time to time, involved in investigations, litigation, disputes or claims related to our business activities, as discussed in Note 10. Our losses are typically resolved over long periods of time and are often difficult to assess and estimate due to, among other reasons, the possibility of multiple actions by third parties; the attribution of damages, if any, among multiple defendants; plaintiffs, in most cases involving personal injury claims, do not specify the amount of damages claimed; the discovery process may take multiple years to complete; during the litigation process, it is common to have multiple complex unresolved procedural and substantive issues; the potential availability of insurance and indemnity coverages; the wide-ranging outcomes reached in similar cases, including the variety of damages awarded; the likelihood of settlements for de minimus amounts prior to trial; the likelihood of success at trial; and the likelihood of success on appeal. Consequently, it is possible future earnings could be affected by changes in our assessments of the probability that a loss has been incurred in a material pending litigation against us and/or changes in our estimates related to such matters.
Foreign Currency Translation	Foreign Currency Translation We translate assets and liabilities of our foreign operations into U.S. dollars at current exchange rates, and we translate income statement items at average exchange rates for the periods presented. We record adjustments resulting from the translation of foreign currency financial statements as a component of Accumulated other comprehensive income. We report foreign currency transaction gains and losses in income. We have included in Other – net transaction gains (losses) of $1.8 million, $(0.6) million and $1.0 million for the years ended December 31, 2021, 2020 and 2019, respectively.
Derivative Financial Instruments	Derivative Financial Instruments Our operations give rise to exposure to market risks from changes in foreign currency exchange ("FX") rates. We use derivative financial instruments, primarily FX forward contracts, to reduce the impact of changes in FX rates on our operating results. We use these instruments to hedge our exposure associated with revenues or costs on our long-term contracts and other transactions that are denominated in currencies other than our operating entities' functional currencies. We do not hold or issue derivative financial instruments for trading or other speculative purposes. We enter into derivative financial instruments primarily as hedges of certain firm purchase and sale commitments and loans between domestic and foreign subsidiaries denominated in foreign currencies. We record these contracts at fair value on our consolidated balance sheets. Based on the hedge designation at inception of the contract, the related gains and losses on these contracts are deferred in stockholders' equity as a component of Accumulated other comprehensive income until the hedged item is recognized in earnings. The gain or loss on a derivative instrument not designated as a hedging instrument is immediately recognized in earnings. Gains and losses on derivative financial instruments that require immediate recognition are included as a component of Other – net on our consolidated statements of income and are recorded in the statements of cash flows based on the nature and use of the instruments. We have designated the majority of our FX forward contracts that qualify for hedge accounting as cash flow hedges. The hedged risk is the risk of changes in functional-currency-equivalent cash flows attributable to changes in FX spot rates of forecasted transactions primarily related to long-term contracts. We exclude from our assessment of effectiveness the portion of the fair value of the FX forward contracts attributable to the difference between FX spot rates and FX forward rates. At December 31, 2021, we had deferred approximately $(0.7) million of net losses on these derivative financial instruments. Assuming market conditions continue, we expect to recognize the majority of this amount in the next twelve months. For the years ended December 31, 2021, 2020 and 2019, we recognized $(0.1) million, $8.7 million and $(1.0) million, respectively, of (gains) losses associated with FX forward contracts not designated as hedging instruments. At December 31, 2021, our derivative financial instruments consisted of FX forward contracts with a total notional value of $352.2 million with maturities extending to November 2023. These instruments consist primarily of FX forward contracts to purchase or sell Canadian dollars and Euros. We are exposed to credit-related losses in the event of non-performance by counterparties to derivative financial instruments. We attempt to mitigate this risk by using major financial institutions with high credit ratings. Our counterparties to derivative financial instruments have the benefit of the same collateral arrangements and covenants as described under our credit facility.
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards There were no accounting standards adopted during the year ended December 31, 2021 that had an impact on our financial position, results of operations, cash flows or disclosures. New Accounting Standards In October 2021, the FASB issued an update to the Topic Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. This update requires entities to recognize and measure contract assets and liabilities acquired in a business combination in accordance with FASB Topic Revenue from Contracts with Customers. The update will generally result in an entity recognizing contract assets and liabilities at amounts consistent with those recorded by the acquiree immediately before the acquisition date rather than at fair value. The new standard is effective on a prospective basis for fiscal years beginning after December 15, 2022, with early adoption permitted. We are currently evaluating the impact, if any, of the adoption of this standard on our financial statements.

Basis of Presentation and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Accounting Policies [Abstract]

Summary of Changes in Carrying Amount of Accrued Warranty Expense

The following summarizes the changes in the carrying amount of Accrued warranty expense:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Balance at beginning of period	$	5,292	$	9,042	$	10,344
Additions	924		1,341		2,232
Expirations and other changes (1)	(424)		(1,624)		(2,728)
Payments	(605)		(1,026)		(1,065)
Translation and other (2)	134		(2,441)		259
Balance at end of period	$	5,321	$	5,292	$	9,042

(1)Includes discounts provided to customers in satisfaction of warranty obligations totaling $(1.2) million in the year ended December 31, 2019.

(2)Includes $(2.5) million related to the divestiture of the U.S.-based commercial nuclear services business during the year ended December 31, 2020.

Restrictions on Cash and Cash Equivalents


	December 31,
	2021		2020
	(In thousands)
Cash and cash equivalents	$	33,891	$	42,610
Restricted cash and cash equivalents	2,896		3,070
Restricted cash and cash equivalents included in Other Assets	2,988		2,618
Total cash and cash equivalents and restricted cash and cash equivalents as presented on our consolidated statements of cash flows	$	39,775	$	48,298

Property, Plant and Equipment

Property, plant and equipment is stated at cost and is set forth below:


	December 31,
	2021		2020
	(In thousands)
Land	$	9,538	$	9,585
Buildings	321,872		267,808
Machinery and equipment	957,423		827,785
Property under construction	487,856		420,374
	1,776,689		1,525,552
Less: Accumulated depreciation	731,049		709,081
Property, Plant and Equipment, Net	$	1,045,640	$	816,471

Changes in Carrying Amount of Goodwill

The following summarizes the changes in the carrying amount of Goodwill:


	Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total
	(In thousands)
Balance at December 31, 2019	$	110,939	$	119,563	$	45,000	$	275,502
Acquisition of Precision Manufacturing (Note 2)	—		5,753		—		5,753
Translation	—		2,453		—		2,453
Balance at December 31, 2020	$	110,939	$	127,769	$	45,000	$	283,708

Translation	—		1,794		—		1,794
Balance at December 31, 2021	$	110,939	$	129,563	$	45,000	$	285,502

Schedule of Intangible Assets

Our Intangible Assets were as follows:


	December 31,
	2021		2020		2019
	(In thousands)
Amortized intangible assets:
Gross cost:
Technical support agreement	$	69,781	$	68,785	$	67,423
Customer relationships	40,247		39,954		39,555
Unpatented technology	38,073		37,529		36,785

CNSC class 1B nuclear facility license	26,911		26,528		26,002
Acquired backlog	7,595		7,487		—
Patented technology	792		780		765

All other	871		858		2,200
Total	$	184,270	$	181,921	$	172,730
Accumulated amortization:
Technical support agreement	$	(10,366)	$	(7,227)	$	(4,153)
Customer relationships	(18,176)		(15,996)		(13,841)
Unpatented technology	(6,398)		(4,584)		(2,805)

CNSC class 1B nuclear facility license	(4,521)		(3,573)		(2,635)
Acquired backlog	(2,531)		(1,248)		—
Patented technology	(363)		(286)		(212)

All other	(194)		(86)		(1,522)
Total	$	(42,549)	$	(33,000)	$	(25,168)
Net amortized intangible assets	$	141,721	$	148,921	$	147,562
Unamortized intangible assets:
NRC category 1 license	$	43,830	$	43,830	$	43,830

Changes in Carrying Amount of Intangible Assets

The following summarizes the changes in the carrying amount of Intangible Assets:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Balance at beginning of period	$	192,751	$	191,392	$	228,676
Acquisitions (Note 2)	—		8,180		—
Amortization expense	(9,329)		(8,824)		(9,128)
Reclassification of right-of-use assets	—		—		(33,866)
Translation and other (1)	2,129		2,003		5,710
Balance at end of period	$	185,551	$	192,751	$	191,392

(1)Includes $(0.6) million related to the divestiture of the U.S.-based commercial nuclear services business during the year ended December 31, 2020.

Estimated Amortization Expense

Estimated amortization expense for the next five fiscal years is as follows (amounts in thousands):


Year Ended December 31,	Amount
2022	$	9,257
2023	$	9,257
2024	$	9,257
2025	$	9,257
2026	$	7,991

Maturities of Lease Liabilities

The maturities of our lease liabilities at December 31, 2021 were as follows (amounts in thousands):


2022	$	3,979
2023	2,664
2024	2,225
2025	1,849
2026	1,831
Thereafter	5,025
Total lease payments	$	17,573
Less: Interest	(2,445)
Present value of lease liabilities (1)	$	15,128

(1)Includes current lease liabilities of $3.9 million.

Changes in Carrying Amount of Debt Issuance Costs

The following summarizes the changes in the carrying amount of these assets:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Balance at beginning of period	$	12,269	$	8,006	$	9,583
Additions	4,838		6,803		—
Interest expense (1)	(6,411)		(2,540)		(1,577)
Balance at end of period	$	10,696	$	12,269	$	8,006

Asset Retirement Obligations

The following summarizes the changes in the carrying amount of these liabilities:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Balance at beginning of period	$	78,110	$	77,288	$	90,822
Costs incurred	(215)		(1,608)		(10,380)
Additions/adjustments	—		(3,284)		(5,030)
Acquisitions	—		—		—
Accretion	5,996		5,343		5,379
Translation and other (1)	241		371		(3,503)
Balance at end of period (2)	$	84,132	$	78,110	$	77,288

(1)Includes an adjustment of $(4.3) million to correct the business combination accounting for our 2016 acquisition during the year ended December 31, 2019.

(2)Includes current asset retirement obligations of $4.7 million, $2.8 million and $5.7 million at December 31, 2021, 2020 and 2019, respectively.

Accumulated Other Comprehensive Income

The components of Accumulated other comprehensive income included in Stockholders' Equity are as follows:


	December 31,
	2021		2020
	(In thousands)
Currency translation adjustments	$	30,627	$	24,454
Net unrealized loss on derivative financial instruments	(694)		(496)
Unrecognized prior service cost on benefit obligations	(18,022)		(15,902)
Net unrealized gain on available-for-sale investments	232		142
Accumulated other comprehensive income	$	12,143	$	8,198

Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income

The amounts reclassified out of Accumulated other comprehensive income by component and the affected consolidated statements of income line items are as follows:


	Year Ended December 31,
	2021		2020		2019
Accumulated Other Comprehensive Income (Loss) Component Recognized	(In thousands)						Line Item Presented
Realized (loss) gain on derivative financial instruments	$	307	$	(35)	$	(132)	Revenues
	(712)		695		(1,066)		Cost of operations
	(405)		660		(1,198)		Total before tax
	103		(173)		310		Provision for Income Taxes
	$	(302)	$	487	$	(888)	Net Income
Amortization of prior service cost on benefit obligations	$	(2,919)	$	(3,177)	$	(2,592)	Other – net
	624		645		562		Provision for Income Taxes
	$	(2,295)	$	(2,532)	$	(2,030)	Net Income



Total reclassification for the period	$	(2,597)	$	(2,045)	$	(2,918)

Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

Disaggregated Revenues

We allocate geographic revenues based on the location of the customers' operations. Revenues by geographic area and customer type were as follows:


	Year Ended December 31, 2021								Year Ended December 31, 2020								Year Ended December 31, 2019
	Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total		Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total		Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total
	(In thousands)
United States:
Government	$	1,527,704	$	—	$	114,465	$	1,642,169	$	1,540,256	$	—	$	113,075	$	1,653,331	$	1,368,555	$	—	$	111,236	$	1,479,791
Non-Government	87,809		44,102		5,560		137,471		98,986		35,432		19,061		153,479		51,802		38,058		17,907		107,767
	$	1,615,513	$	44,102	$	120,025	$	1,779,640	$	1,639,242	$	35,432	$	132,136	$	1,806,810	$	1,420,357	$	38,058	$	129,143	$	1,587,558
Canada:

Non-Government	$	—	$	345,412	$	3,417	$	348,829	$	—	$	309,433	$	4,357	$	313,790	$	—	$	287,948	$	2,196	$	290,144

Other:

Non-Government	$	7,085	$	17,568	$	96	$	24,749	$	7,015	$	26,404	$	—	$	33,419	$	8,230	$	26,634	$	—	$	34,864

Segment Revenues	$	1,622,598	$	407,082	$	123,538	2,153,218		$	1,646,257	$	371,269	$	136,493	2,154,019		$	1,428,587	$	352,640	$	131,339	1,912,566
Eliminations							(29,144)								(30,503)								(17,646)
Revenues							$	2,124,074							$	2,123,516							$	1,894,920

Revenues by timing of transfer of goods or services were as follows:


	Year Ended December 31, 2021								Year Ended December 31, 2020								Year Ended December 31, 2019
	Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total		Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total		Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total
	(In thousands)								(In thousands)								(In thousands)
Over time	$	1,622,462	$	355,477	$	123,538	$	2,101,477	$	1,646,092	$	322,745	$	136,493	$	2,105,330	$	1,428,348	$	305,075	$	131,339	$	1,864,762
Point-in-time	136		51,605		—		51,741		165		48,524		—		48,689		239		47,565		—		47,804
Segment Revenues	$	1,622,598	$	407,082	$	123,538	2,153,218		$	1,646,257	$	371,269	$	136,493	2,154,019		$	1,428,587	$	352,640	$	131,339	1,912,566
Eliminations							(29,144)								(30,503)								(17,646)
Revenues							$	2,124,074							$	2,123,516							$	1,894,920

Revenues by contract type were as follows:


	Year Ended December 31, 2021								Year Ended December 31, 2020								Year Ended December 31, 2019
	Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total		Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total		Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total
	(In thousands)								(In thousands)								(In thousands)
Fixed-Price Incentive Fee	$	1,244,916	$	9,279	$	—	$	1,254,195	$	1,226,770	$	1,578	$	—	$	1,228,348	$	1,137,883	$	2,511	$	—	$	1,140,394
Firm-Fixed-Price	271,656		307,200		38,151		617,007		306,296		296,394		32,334		635,024		210,631		282,014		26,163		518,808
Cost-Plus Fee	104,365		—		73,621		177,986		112,479		—		94,320		206,799		79,741		755		102,726		183,222
Time-and-Materials	1,661		90,603		11,766		104,030		712		73,297		9,839		83,848		332		67,360		2,450		70,142
Segment Revenues	$	1,622,598	$	407,082	$	123,538	2,153,218		$	1,646,257	$	371,269	$	136,493	2,154,019		$	1,428,587	$	352,640	$	131,339	1,912,566
Eliminations							(29,144)								(30,503)								(17,646)
Revenues							$	2,124,074							$	2,123,516							$	1,894,920

Contract with Customer, Asset and Liability

Retainages also vary as a result of timing differences between incurring costs and achieving milestones that allow us to recover these amounts.


	December 31,		December 31,
	2021		2020
	(In thousands)
Included in Contracts in progress:
Unbilled receivables	$	528,644	$	436,279
Retainages	$	51,507	$	55,172
Included in Other Assets:
Retainages	$	1,271	$	1,488
Advance billings on contracts	$	111,619	$	83,581

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

Of the remaining performance obligations on our contracts with customers at December 31, 2021, we expect to recognize revenues as follows:


	2022		2023		Thereafter		Total
	(In approximate millions)
Nuclear Operations Group	$	1,573	$	1,102	$	1,836	$	4,511
Nuclear Power Group	260		142		242		644
Nuclear Services Group	21		—		—		21
Total Remaining Performance Obligations	$	1,854	$	1,244	$	2,078	$	5,176

Equity Method Investments (Tables)

12 Months Ended

Dec. 31, 2021

Equity Method Investments and Joint Ventures [Abstract]

Summary of Combined Balance Sheet Information

The following tables summarize combined balance sheet and income statement information for investments accounted for under the equity method:


	December 31,
	2021		2020
	(In thousands)
Current assets	$	546,233	$	492,025
Noncurrent assets	634		970
Total Assets	$	546,867	$	492,995
Current liabilities	$	284,821	$	270,536
Owners' equity	262,046		222,459
Total Liabilities and Owners' Equity	$	546,867	$	492,995

Summary of Combined Income Statement Information


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Revenues	$	4,254,635	$	3,980,066	$	3,716,548
Gross profit	$	159,935	$	142,709	$	133,170
Net income	$	156,994	$	139,988	$	130,949

Reconciliation of Net Income to Equity in Income

Reconciliations of net income per combined income statement information of our investees to equity in income of investees per our consolidated statements of income are as follows:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Equity income based on stated ownership percentages	$	31,870	$	27,266	$	28,272
Timing of GAAP and other adjustments	1,628		(114)		652
Equity in income of investees	$	33,498	$	27,152	$	28,924

Schedule of Transactions with Unconsolidated Affiliates

Our transactions with unconsolidated affiliates were as follows:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Sales to	$	11,838	$	12,186	$	14,668
Dividends received	$	20,475	$	25,005	$	20,955
Capital contributions, net of returns	$	—	$	(88)	$	(255)

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

Reconciliation of Unrecognized Tax Benefits


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Balance at beginning of period	$	5,852	$	3,899	$	274
Increases based on tax positions taken in the current year	964		2,075		3,736
Increases based on tax positions taken in the prior years	—		—		—
Decreases based on tax positions taken in the prior years	—		—		—
Decreases due to settlements with tax authorities	(6,775)		—		—
Decreases due to lapse of applicable statute of limitation	(41)		(123)		(127)
Other, net	—		1		16
Balance at end of period	$	—	$	5,852	$	3,899

Components of Deferred Tax Assets and Liabilities

Significant components of deferred tax assets and liabilities as of December 31, 2021 and 2020 were as follows:


	December 31,
	2021		2020
	(In thousands)
Deferred tax assets:
Pension liability	$	12,047	$	31,152
Accrued warranty expense	1,363		1,338
Accrued vacation pay	7,633		7,442
Accrued liabilities for self-insurance (including postretirement health care benefits)	2,095		2,602
Accrued liabilities for executive and employee incentive compensation	10,733		13,312
Environmental and products liabilities	21,050		20,261
Lease liabilities	3,667		2,155
Investments in joint ventures and affiliated companies	2,283		1,148
Long-term contracts	21,562		15,974
Accrued payroll taxes	4,753		4,828
U.S. federal tax credits and loss carryforward	7,023		7,224
U.S. state tax credits and loss carryforward	4,866		6,819
Foreign tax credit and loss carryforward	16,477		9,919
Other	2,568		4,961
Total deferred tax assets	118,120		129,135
Valuation allowance for deferred tax assets	(13,218)		(12,892)
Deferred tax assets	104,902		116,243
Deferred tax liabilities:
Property, plant and equipment	66,636		39,315
Right-of-use lease assets	11,666		10,509
Intangibles	16,365		17,004

Total deferred tax liabilities	94,667		66,828
Net deferred tax assets	$	10,235	$	49,415

Income from Continuing Operations Before Provision for Income Taxes

The components of Income before Provision for Income Taxes were as follows:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
U.S.	$	343,091	$	314,150	$	270,569
Other than U.S.	52,622		48,022		43,173
Income before Provision for Income Taxes	$	395,713	$	362,172	$	313,742

Components of Provision for Income Taxes

The components of Provision for Income Taxes were as follows:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
Current:
U.S. – federal	$	31,535	$	53,340	$	47,693
U.S. – state and local	1,030		7,587		2,180
Other than U.S.	16,769		14,159		15,398
Total current	49,334		75,086		65,271
Deferred:
U.S. – federal	40,463		10,852		7,975
U.S. – state and local	3,473		(536)		872
Other than U.S.	(3,845)		(2,426)		(5,053)
Total deferred	40,091		7,890		3,794
Provision for Income Taxes	$	89,425	$	82,976	$	69,065

Reconciliation of Income Tax Provision Related to Continuing Operations from U.S. Statutory Federal Tax Rate

The following is a reconciliation of our income tax provision from the U.S. statutory federal tax rate to our consolidated effective tax rate:


	Year Ended December 31,
	2021		2020		2019
U.S. federal statutory tax rate	21.0	%	21.0	%	21.0	%
State and local income taxes	1.1	%	1.9	%	1.0	%
Foreign rate differential	0.6	%	0.6	%	0.6	%
Excess tax deductions on equity compensation	(0.1)	%	(0.3)	%	(0.7)	%



Other	—	%	(0.3)	%	0.1	%
Effective tax rate	22.6	%	22.9	%	22.0	%

Valuation Allowance for Deferred Tax Assets

The following is an analysis of our valuation allowance for deferred tax assets:


	Beginning Balance		Charges To Costs and Expenses	Charged To Other Accounts	Ending Balance
	(In thousands)
Year Ended December 31, 2021	$	(12,892)	(326)	—	$	(13,218)
Year Ended December 31, 2020	$	(13,578)	771	(85)	$	(12,892)
Year Ended December 31, 2019	$	(13,257)	(414)	93	$	(13,578)

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Components of Long-Term Debt

Our Long-Term Debt consists of the following:


	December 31,
	2021		2020
	(In thousands)
Debt Instruments:
Senior Notes	$	800,000	$	800,000
Credit Facility	400,000		75,000

Long-Term Debt, gross	1,200,000		875,000
Less: Deferred debt issuance costs	10,696		12,269
Long-Term Debt	$	1,189,304	$	862,731

Pension Plans and Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2021

Retirement Benefits [Abstract]

Obligations and Funded Status


	Pension Benefits Year Ended December 31,				Other Benefits Year Ended December 31,
	2021		2020		2021		2020
	(In thousands)
Change in benefit obligation:
Benefit obligation at beginning of period	$	1,414,055	$	1,308,798	$	61,086	$	58,881
Service cost	11,667		10,650		760		642
Interest cost	27,170		37,199		1,197		1,612
Plan participants' contributions	199		180		488		562
Amendments	2,314		2,333		3,402		—

Settlements	(38,330)		(7,041)		—		—
Actuarial loss (gain)	(45,476)		120,126		(4,944)		2,219

Foreign currency exchange rate changes	1,669		3,513		197		331
Benefits paid	(65,002)		(61,703)		(2,885)		(3,161)
Benefit obligation at end of period	$	1,308,266	$	1,414,055	$	59,301	$	61,086
Change in plan assets:
Fair value of plan assets at beginning of period	$	1,281,232	$	1,150,495	$	52,077	$	48,321
Actual return on plan assets	72,030		190,862		2,898		5,293
Plan participants' contributions	199		180		488		562
Company contributions	6,164		5,131		1,008		992
Settlements	(39,439)		(7,041)		—		—

Foreign currency exchange rate changes	1,615		3,308		—		—
Benefits paid	(65,002)		(61,703)		(2,959)		(3,091)
Fair value of plan assets at the end of period	1,256,799		1,281,232		53,512		52,077
Funded status	$	(51,467)	$	(132,823)	$	(5,789)	$	(9,009)
Amounts recognized in the balance sheet consist of:
Prepaid postretirement benefit obligation	$	—	$	—	$	20,122	$	18,069
Prepaid pension	10,573		14,588		—		—
Accrued employee benefits	(3,125)		(3,082)		(1,578)		(1,389)
Accumulated postretirement benefit obligation	—		—		(24,333)		(25,689)
Pension liability	(58,915)		(144,329)		—		—
Accrued benefit liability, net	$	(51,467)	$	(132,823)	$	(5,789)	$	(9,009)
Amount recognized in accumulated comprehensive income (before taxes):
Prior service cost (credit)	$	20,536	$	21,319	$	2,520	$	(1,059)
Supplemental information:
Plans with accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	$	1,172,881	$	1,264,764	N/A		N/A
Accumulated benefit obligation	$	1,166,855	$	1,255,899	$	23,503	$	24,593
Fair value of plan assets	$	1,110,841	$	1,117,353	$	—	$	—
Plans with plan assets in excess of accumulated benefit obligation:
Projected benefit obligation	$	135,385	$	149,291	N/A		N/A
Accumulated benefit obligation	$	135,375	$	149,270	$	35,798	$	36,493
Fair value of plan assets	$	145,958	$	163,879	$	53,512	$	52,077

Components of Net Periodic Benefit Cost

Components of net periodic benefit cost included in net income are as follows:


	Pension Benefits Year Ended December 31,						Other Benefits Year Ended December 31,
	2021		2020		2019		2021		2020		2019
	(In thousands)
Components of net periodic benefit cost:
Service cost	$	11,667	$	10,650	$	9,123	$	760	$	642	$	545
Interest cost	27,170		37,199		46,307		1,197		1,612		2,254
Expected return on plan assets	(81,778)		(77,298)		(69,809)		(2,891)		(2,691)		(2,514)
Amortization of prior service cost	3,097		3,370		2,903		(178)		(193)		(311)
Recognized net actuarial loss (gain)	(34,690)		6,829		9,353		(4,876)		(458)		(5,723)
Net periodic benefit cost (income)	$	(74,534)	$	(19,250)	$	(2,123)	$	(5,988)	$	(1,088)	$	(5,749)

Summary of Additional Information

Additional Information


	Pension Benefits Year Ended December 31,				Other Benefits Year Ended December 31,
	2021		2020		2021		2020
	(In thousands)
Decrease in accumulated other comprehensive income due to actuarial losses – before taxes	$	(2,314)	$	(2,333)	$	(3,402)	$	—

Weighted Average Assumptions

Assumptions


	Pension Benefits				Other Benefits
	2021		2020		2021		2020
Weighted-average assumptions used to determine net periodic benefit obligations at December 31:
Discount rate	2.91	%	2.63	%	2.85	%	2.49	%


	Pension Benefits						Other Benefits
	2021		2020		2019		2021		2020		2019
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31:
Discount rate to determine interest cost	1.96	%	2.78	%	3.98	%	1.87	%	2.62	%	3.92	%
Expected return on plan assets	6.80	%	6.95	%	6.95	%	5.66	%	5.66	%	5.68	%

Assumed health-care cost trend rates

All of the assets for these postretirement benefit plans are contributed into a Voluntary Employees' Beneficiary Association trust.


	2021		2020
Assumed health care cost trend rates at December 31:
Health care cost trend rate assumed for next year	7.50	%	6.75	%
Rates to which the cost trend rate is assumed to decline (ultimate trend rate)	4.50	%	4.50	%
Year that the rate reaches ultimate trend rate	2034		2030

Plan Asset Allocations by Asset Category

The following is a summary of the asset allocations for the Master Trust at December 31, 2021 and 2020 by asset category:


	December 31,
	2021		2020
Asset Category:
Commingled and Mutual Funds	29	%	29	%
U.S. Government Securities	32	%	28	%
Fixed Income (excluding U.S. Government Securities)	11	%	18	%
Diversified Credit	11	%	11	%
Real Estate	11	%	7	%
Partnerships with Security Holdings	4	%	4	%
Other	2	%	3	%
Total	100	%	100	%

The combined weighted-average asset allocations of these plans at December 31, 2021 and 2020 by asset category were as follows:


	December 31,
	2021		2020
Asset Category:
Fixed Income	20	%	98	%
Commingled and Mutual Funds	11	%	—	%
Cash and Other	69	%	2	%
Total	100	%	100	%

Target Allocation by Asset Class

The target allocation for 2022 for the domestic plans, by asset class, is as follows:


Asset Class:
Fixed Income	45	%
Equities	28	%
Other	27	%

The target allocation for 2022 for the Canadian plans, by asset class, is as follows:


Asset Class:
Fixed Income	20	%
Equities	11	%
Cash and Other	69	%

Summary of Total Investments Measured at Fair Value

The following is a summary of total assets for our plans measured at fair value at December 31, 2021:


	12/31/2021		Level 1		Level 2		Level 3		Unclassified
	(In thousands)
Pension and Other Benefits:
U.S. Government Securities	$	369,980	$	365,295	$	4,685	$	—	$	—
Commingled and Mutual Funds	358,423		77,680		—		—		280,743
Fixed Income	182,169		31,856		128,829		—		21,484
Diversified Credit	133,508		—		—		—		133,508
Real Estate	126,886		—		—		—		126,886
Investment Contract (1)	46,817		—		—		46,817		—
Partnerships with Security Holdings	46,515		—		—		—		46,515
Cash, Cash Equivalents and Accrued Items (2)	46,013		—		—		—		46,013
Total Assets	$	1,310,311	$	474,831	$	133,514	$	46,817	$	655,149

The following is a summary of total assets for our plans measured at fair value at December 31, 2020:


	12/31/2020		Level 1		Level 2		Level 3		Unclassified
	(In thousands)
Pension and Other Benefits:
Fixed Income	$	391,418	$	—	$	228,857	$	—	$	162,561
Commingled and Mutual Funds	338,473		72,764		—		—		265,709
U.S. Government Securities	316,375		310,975		5,400		—		—
Diversified Credit	126,823		—		—		—		126,823
Real Estate	77,437		—		—		—		77,437
Partnerships with Security Holdings	49,007		—		—		—		49,007
Cash, Cash Equivalents and Accrued Items (1)	33,776		—		—		—		33,776
Total Assets	$	1,333,309	$	383,739	$	234,257	$	—	$	715,313

The following is a summary of the changes in the Plans' Level 3 instruments for the year ended December 31, 2021:


	Year Ended December 31,
	2021
	(In thousands)
Balance at beginning of period	$	—
Purchases	45,645
Unrealized gain	652
Translation	520
Balance at end of period	$	46,817

Cash Flows


	Domestic Plans				Foreign Plans
	Pension Benefits		Other Benefits		Pension Benefits		Other Benefits
	(In thousands)
Expected employer contributions to trusts of defined benefit plans:
2022	$	—	$	90	$	10,579	N/A
Expected benefit payments:
2022	$	61,599	$	2,924	$	3,588	$	526
2023	$	63,669	$	2,914	$	3,802	$	547
2024	$	65,271	$	2,959	$	4,009	$	557
2025	$	66,406	$	2,914	$	4,212	$	586
2026	$	67,253	$	2,855	$	4,390	$	639
2027-2031	$	337,288	$	12,881	$	24,724	$	3,404

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Summarized Activity of Stock Options

The following table summarizes activity for our stock options for the year ended December 31, 2021 (share data in thousands):


	Number of Shares	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (In millions)
Outstanding at beginning of period	201	$	24.07
Granted	—	N/A
Exercised	(76)	$	24.77
Cancelled/expired/forfeited	—	N/A
Outstanding at end of period	125	$	23.65	3.2 years	$	3.0
Exercisable at end of period	125	$	23.65	3.2 years	$	3.0

Schedule of Restricted Stock Units

Nonvested performance shares as of December 31, 2021 and changes during the year ended December 31, 2021 were as follows (share data in thousands):


	Number of Shares	Weighted- Average Grant Date Fair Value
Nonvested at beginning of period	451	$	56.15
Adjustment to assumed vesting percentage	52	$	58.51
Granted	159	$	59.39
Vested	(104)	$	63.81
Cancelled/forfeited	(13)	$	56.23
Nonvested at end of period	545	$	55.90

The actual tax benefits realized related to the performance shares vested during the year ended December 31, 2021 totaled $1.0 million.

Restricted Stock Units

Nonvested restricted stock units as of December 31, 2021 and changes during the year ended December 31, 2021 were as follows (share data in thousands):


	Number of Shares	Weighted- Average Grant Date Fair Value
Nonvested at beginning of period	185	$	55.96
Granted	150	$	60.29
Vested	(107)	$	58.45
Cancelled/forfeited	(7)	$	57.09
Nonvested at end of period	221	$	57.66

Schedule of Summarized Activity of Stock Appreciation

The following table summarizes activity for our stock appreciation rights for the year ended December 31, 2021 (unit data in thousands):


	Number of Units	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (In millions)
Outstanding at beginning of period	40	$	24.04
Granted	—	N/A
Exercised	(13)	$	24.97
Cancelled/expired/forfeited	—	N/A
Outstanding at end of period	27	$	23.62	3.2 years	$	0.7
Exercisable at end of period	27	$	23.62	3.2 years	$	0.7

Investments (Tables)

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Summary of Available for Sale Securities

The following is a summary of our investments at December 31, 2021:


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(In thousands)
Equity securities

Mutual funds	$	6,001	$	1,649	$	—	$	7,650
Available-for-sale securities
U.S. Government and agency securities	2,742		—		(4)		2,738
Corporate bonds	2,559		374		(7)		2,926
Asset-backed securities and collateralized mortgage obligations	107		—		(52)		55
Total	$	11,409	$	2,023	$	(63)	$	13,369

The following is a summary of our investments at December 31, 2020:


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(In thousands)
Equity securities
Equities	$	172	$	628	$	—	$	800
Mutual funds	5,323		1,432		—		6,755
Available-for-sale securities
U.S. Government and agency securities	2,317		1		(4)		2,314
Corporate bonds	2,879		259		(6)		3,132
Asset-backed securities and collateralized mortgage obligations	115		—		(53)		62
Total	$	10,806	$	2,320	$	(63)	$	13,063

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Summary of Investments and Available-for-Sale Securities Measured at Fair Value

The following is a summary of our investments measured at fair value at December 31, 2021:


	12/31/2021		Level 1		Level 2		Level 3		Unclassified
	(In thousands)
Equity securities

Mutual funds	$	7,650	$	—	$	7,650	$	—	$	—
Available-for-sale securities
U.S. Government and agency securities	2,738		2,738		—		—		—
Corporate bonds	2,926		1,852		1,074		—		—
Asset-backed securities and collateralized mortgage obligations	55		—		55		—		—
Total	$	13,369	$	4,590	$	8,779	$	—	$	—

The following is a summary of our investments measured at fair value at December 31, 2020:


	12/31/2020		Level 1		Level 2		Level 3		Unclassified
	(In thousands)
Equity securities
Equities	$	800	$	—	$	—	$	800	$	—
Mutual funds	6,755		—		6,755		—		—
Available-for-sale securities
U.S. Government and agency securities	2,314		2,314		—		—		—
Corporate bonds	3,132		1,738		1,394		—		—
Asset-backed securities and collateralized mortgage obligations	62		—		62		—		—
Total	$	13,063	$	4,052	$	8,211	$	800	$	—

Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2021

Segment Reporting [Abstract]

Schedule of Operating Results by Segment

1. Information about Operations in our Different Industry Segments:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
REVENUES:
Nuclear Operations Group	$	1,622,598	$	1,646,257	$	1,428,587
Nuclear Power Group	407,082		371,269		352,640
Nuclear Services Group	123,538		136,493		131,339
Eliminations (1)	(29,144)		(30,503)		(17,646)
	$	2,124,074	$	2,123,516	$	1,894,920

(1)Segment revenues are net of the following intersegment transfers:


Nuclear Operations Group Transfers	$	(5,402)	$	(3,791)	$	(4,382)
Nuclear Power Group Transfers	(778)		(553)		(208)
Nuclear Services Group Transfers	(22,964)		(26,159)		(13,056)
	$	(29,144)	$	(30,503)	$	(17,646)


OPERATING INCOME:
Nuclear Operations Group	$	308,645	$	326,049	$	298,328
Nuclear Power Group	52,548		51,989		53,815
Nuclear Services Group	27,932		26,436		14,226
Other	(24,333)		(22,309)		(23,099)
	$	364,792	$	382,165	$	343,270
Unallocated Corporate (1)	(18,944)		(23,613)		(17,749)
Total Operating Income (2)	$	345,848	$	358,552	$	325,521
Other Income (Expense)	49,865		3,620		(11,779)
Income before Provision for Income Taxes	$	395,713	$	362,172	$	313,742

(1)Unallocated Corporate includes general corporate overhead not allocated to segments.

(2)The following amounts are included in Operating Income:


Losses (Gains) on Asset Disposals and Impairments, Net:
Nuclear Operations Group	$	(8)	$	(8)	$	(6)
Nuclear Power Group	(2,548)		(1,681)		103
Nuclear Services Group	—		328		2,727
Other	—		—		—
Unallocated Corporate	(976)		—		—
	$	(3,532)	$	(1,361)	$	2,824
Equity in Income of Investees:
Nuclear Operations Group	$	—	$	—	$	—
Nuclear Power Group	—		—		—
Nuclear Services Group	33,498		27,152		28,924
Other	—		—		—
	$	33,498	$	27,152	$	28,924


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
CAPITAL EXPENDITURES:
Nuclear Operations Group	$	143,945	$	135,637	$	133,279
Nuclear Power Group	153,571		106,596		38,053
Nuclear Services Group	2,940		1,326		1,169
Other	166		252		2,597
Segment Capital Expenditures	300,622		243,811		175,098
Corporate Capital Expenditures	10,430		11,216		7,026
Total Capital Expenditures	$	311,052	$	255,027	$	182,124
DEPRECIATION AND AMORTIZATION:
Nuclear Operations Group	$	40,514	$	33,174	$	33,231
Nuclear Power Group	19,774		18,325		17,054
Nuclear Services Group	1,005		1,685		3,246
Other	1,076		645		787
Segment Depreciation and Amortization	62,369		53,829		54,318
Corporate Depreciation and Amortization	6,711		6,845		7,404
Total Depreciation and Amortization	$	69,080	$	60,674	$	61,722


	December 31,
	2021		2020		2019
	(In thousands)
SEGMENT ASSETS:
Nuclear Operations Group	$	1,243,766	$	1,184,741	$	986,827
Nuclear Power Group	974,372		828,729		580,413
Nuclear Services Group	186,249		166,240		177,952
Other	2,858		3,638		3,751
Segment Assets	2,407,245		2,183,348		1,748,943
Corporate Assets	94,135		110,155		159,970
Total Assets	$	2,501,380	$	2,293,503	$	1,908,913
INVESTMENT IN UNCONSOLIDATED AFFILIATES:
Nuclear Operations Group	$	—	$	—	$	—
Nuclear Power Group	—		—		—
Nuclear Services Group	85,284		71,806		70,116
Other	—		—		—
Total Investment in Unconsolidated Affiliates	$	85,284	$	71,806	$	70,116

Schedule of Revenue Information from Products and Service Lines

2. Information about our Product and Service Lines:


	Year Ended December 31,
	2021		2020		2019
	(In thousands)
REVENUES:
Nuclear Operations Group:
Government Programs	$	1,527,704	$	1,540,256	$	1,368,555
Commercial Operations	94,894		106,001		60,032
	1,622,598		1,646,257		1,428,587
Nuclear Power Group:
Nuclear Manufacturing	246,444		250,585		243,472
Nuclear Services and Engineering	160,638		120,684		109,168
	407,082		371,269		352,640
Nuclear Services Group:
Nuclear Environmental Services	77,514		94,320		102,726
Nuclear Services and Advanced Reactor Design and Engineering	46,024		42,173		28,613
	123,538		136,493		131,339

Eliminations	(29,144)		(30,503)		(17,646)
	$	2,124,074	$	2,123,516	$	1,894,920

Schedule of Property, Plant and Equipment, Net by Geographical Area

3. Information about our Consolidated Operations in Different Geographic Areas:


	December 31,
	2021		2020		2019
	(In thousands)
NET PROPERTY, PLANT AND EQUIPMENT:
U.S.	$	698,772	$	603,518	$	494,202
Canada	346,868		212,953		86,039
	$	1,045,640	$	816,471	$	580,241

See Note 3 for revenues by geographic area for each of our segments.

Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2021

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Information

The following tables set forth selected unaudited quarterly financial information for the years ended December 31, 2021 and 2020:


	Year Ended December 31, 2021 Quarter Ended
	March 31, 2021		June 30, 2021		September 30, 2021		December 31, 2021
	(In thousands, except per share amounts)
Revenues	$	528,273	$	505,099	$	498,727	$	591,975
Operating income (1)	$	82,414	$	73,751	$	87,468	$	102,215
Equity in income of investees	$	8,316	$	7,263	$	10,618	$	7,301
Net Income Attributable to BWX Technologies, Inc.	$	69,749	$	59,347	$	59,914	$	116,861
Earnings per common share:
Basic:
Net Income Attributable to BWX Technologies, Inc.	$	0.73	$	0.62	$	0.64	$	1.27
Diluted:
Net Income Attributable to BWX Technologies, Inc.	$	0.73	$	0.62	$	0.63	$	1.26

(1)Includes equity in income of investees.


	Year Ended December 31, 2020 Quarter Ended
	March 31, 2020		June 30, 2020		September 30, 2020		December 31, 2020
	(In thousands, except per share amounts)
Revenues	$	542,208	$	504,520	$	519,878	$	556,910
Operating income (1)	$	98,267	$	82,434	$	88,770	$	89,081
Equity in income of investees	$	6,063	$	4,913	$	8,271	$	7,905
Net Income Attributable to BWX Technologies, Inc.	$	75,499	$	64,258	$	73,171	$	65,742
Earnings per common share:
Basic:
Net Income Attributable to BWX Technologies, Inc.	$	0.79	$	0.67	$	0.77	$	0.69
Diluted:
Net Income Attributable to BWX Technologies, Inc.	$	0.79	$	0.67	$	0.76	$	0.69

(1)Includes equity in income of investees.

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share:


	Year Ended December 31,
	2021		2020		2019
	(In thousands, except shares and per share amounts)
Basic:
Net Income Attributable to BWX Technologies, Inc.	$	305,871	$	278,670	$	244,115
Weighted-average common shares	94,278,894		95,457,193		95,377,414
Basic earnings per common share	$	3.24	$	2.92	$	2.56
Diluted:
Net Income Attributable to BWX Technologies, Inc.	$	305,871	$	278,670	$	244,115
Weighted-average common shares (basic)	94,278,894		95,457,193		95,377,414
Effect of dilutive securities:
Stock options, restricted stock units and performance shares (1)	239,528		269,304		433,124
Adjusted weighted-average common shares	94,518,422		95,726,497		95,810,538
Diluted earnings per common share	$	3.24	$	2.91	$	2.55

(1)At December 31, 2021, 2020 and 2019, none of our shares were antidilutive.

Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) $ in Thousands		12 Months Ended
	May 29, 2020 USD ($)	Dec. 31, 2021 USD ($) segment component facility	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Basis Of Presentation And Significant Accounting Policies [Line Items]
Number of reportable segments \| segment		3
Number of large, heavy components supplied to worldwide (more than) \| component		1,300
Research and development activities		$ 31,400	$ 40,800	$ 66,900
Research and development activities, paid by customers		20,300	26,600	49,200
Interest expense		51,100	40,800	41,400
Interest costs capitalized		15,300	9,800	6,100
Restricted cash and cash equivalents reclassified into other assets		5,900
Restricted cash and cash equivalents		2,896	3,070
Total inventories		16,300	15,000
Depreciation		58,100	50,300	51,000
Lease expense		8,400	7,700	8,100
Cash payments for leases		$ 6,700
Weighted average remaining lease term		6 years 8 months 12 days
Weighted average discount rate		4.19%
Number of facilities with U.S. Government decommissioning costs obligation \| facility		2
Reserves for self-insurance		$ 4,500	5,000
Net foreign currency transaction gains (losses)		1,800	(600)	1,000
Net gains deferred on derivative financial instruments in accumulated other comprehensive income (loss)		(700)
Gains recognized in other-net associated with derivative financial instruments		(100)	8,700	$ (1,000)
Notional amount of foreign currency forward contracts		352,200
Favorable operating lease
Basis Of Presentation And Significant Accounting Policies [Line Items]
Amortization		1,700
Nuclear Services Business
Basis Of Presentation And Significant Accounting Policies [Line Items]
Net assets exchanged in noncash transaction	$ 18,000
Accounts Receivable
Basis Of Presentation And Significant Accounting Policies [Line Items]
Canada Emergency Wage Subsidy (CEWS) grant		$ 5,400	$ 20,400
Minimum
Basis Of Presentation And Significant Accounting Policies [Line Items]
Operating lease contract term		1 year
Operating lease renewal contract term		1 year
Minimum \| Machinery and equipment
Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful life		3 years
Minimum \| Property, Plant and Equipment
Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful life		8 years
Maximum
Basis Of Presentation And Significant Accounting Policies [Line Items]
Operating lease contract term		20 years
Operating lease renewal contract term		10 years
Maximum \| Machinery and equipment
Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful life		14 years
Maximum \| Property, Plant and Equipment
Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful life		40 years
Cash Held For Decommissioning Of Facilities
Basis Of Presentation And Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents		$ 3,000
Cash Held To Meet Reinsurance Reserve Requirements
Basis Of Presentation And Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents		$ 2,900

Basis of Presentation and Significant Accounting Policies - Summary of Changes in Carrying Amount of Accrued Warranty Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance at beginning of period	$ 5,292	$ 9,042	$ 10,344
Additions	924	1,341	2,232
Expirations and other changes	(424)	(1,624)	(2,728)
Payments	(605)	(1,026)	(1,065)
Translation	134	(2,441)	259
Balance at end of period	$ 5,321	5,292	9,042
Product Warranty Accrual Warrant Discount			$ (1,200)
Amount included from divestiture of business		$ (2,500)

Basis of Presentation and Significant Accounting Policies - Cash and Cash Equivalents and Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Cash and cash equivalents	$ 33,891	$ 42,610
Restricted cash and cash equivalents	2,896	3,070
Restricted cash and cash equivalents included in Other Assets	2,988	2,618
Total cash and cash equivalents and restricted cash and cash equivalents as presented on our consolidated statements of cash flows	$ 39,775	$ 48,298	$ 92,400	$ 36,408

Basis of Presentation and Significant Accounting Policies - Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 1,776,689	$ 1,525,552
Less: Accumulated depreciation	731,049	709,081
Property, Plant and Equipment, Net	1,045,640	816,471	$ 580,241
Land
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	9,538	9,585
Buildings
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	321,872	267,808
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	957,423	827,785
Property under construction
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 487,856	$ 420,374

Basis of Presentation and Significant Accounting Policies - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Beginning balance	$ 283,708	$ 275,502
Goodwill, Acquired During Period		5,753
Translation and other	1,794	2,453
Ending balance	285,502	283,708
Nuclear Operations Group
Goodwill [Roll Forward]
Beginning balance	110,939	110,939
Goodwill, Acquired During Period		0
Translation and other	0	0
Ending balance	110,939	110,939
Nuclear Services Group
Goodwill [Roll Forward]
Beginning balance	127,769	119,563
Goodwill, Acquired During Period		5,753
Translation and other	1,794	2,453
Ending balance	129,563	127,769
Nuclear Services Group
Goodwill [Roll Forward]
Beginning balance	45,000	45,000
Goodwill, Acquired During Period		0
Translation and other	0	0
Ending balance	$ 45,000	$ 45,000

Basis of Presentation and Significant Accounting Policies - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Amortized And Unamortized Intangible Assets [Line Items]
Amortized intangible assets	$ 184,270	$ 181,921	$ 172,730
Accumulated amortization	(42,549)	(33,000)	(25,168)
Net amortized intangible assets	141,721	148,921	147,562
Technical support agreement
Schedule Of Amortized And Unamortized Intangible Assets [Line Items]
Amortized intangible assets	69,781	68,785	67,423
Accumulated amortization	(10,366)	(7,227)	(4,153)
Customer relationships
Schedule Of Amortized And Unamortized Intangible Assets [Line Items]
Amortized intangible assets	40,247	39,954	39,555
Accumulated amortization	(18,176)	(15,996)	(13,841)
Unpatented technology
Schedule Of Amortized And Unamortized Intangible Assets [Line Items]
Amortized intangible assets	38,073	37,529	36,785
Accumulated amortization	(6,398)	(4,584)	(2,805)
CNSC class 1B nuclear facility license
Schedule Of Amortized And Unamortized Intangible Assets [Line Items]
Amortized intangible assets	26,911	26,528	26,002
Accumulated amortization	(4,521)	(3,573)	(2,635)
Acquired backlog
Schedule Of Amortized And Unamortized Intangible Assets [Line Items]
Amortized intangible assets	7,595	7,487	0
Accumulated amortization	(2,531)	(1,248)	0
Patented technology
Schedule Of Amortized And Unamortized Intangible Assets [Line Items]
Amortized intangible assets	792	780	765
Accumulated amortization	(363)	(286)	(212)
All other
Schedule Of Amortized And Unamortized Intangible Assets [Line Items]
Amortized intangible assets	871	858	2,200
Accumulated amortization	(194)	(86)	(1,522)
NRC category 1 license
Schedule Of Amortized And Unamortized Intangible Assets [Line Items]
Unamortized intangible assets	$ 43,830	$ 43,830	$ 43,830

Basis of Presentation and Significant Accounting Policies - Changes in Carrying Amount of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Balance at beginning of period	$ 192,751	$ 191,392	$ 228,676
Acquisitions (Note 2)	0	8,180	0
Amortization expense	(9,329)	(8,824)	(9,128)
Reclassification of right-of-use assets	0	0	(33,866)
Translation and other	2,129	2,003	5,710
Balance at end of period	185,551	$ 192,751	$ 191,392
Nuclear Services Group
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Translation and other	$ (600)

Basis of Presentation and Significant Accounting Policies - Estimated Amortization Expense (Detail) $ in Thousands	Dec. 31, 2021 USD ($)
Accounting Policies [Abstract]
2022	$ 9,257
2023	9,257
2024	9,257
2025	9,257
2026	$ 7,991

Basis of Presentation and Significant Accounting Policies - Leases (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items]
2022	$ 3,979
2023	2,664
2024	2,225
2025	1,849
2026	1,831
Thereafter	5,025
Total lease payments	17,573
Less: Interest	(2,445)
Present value of lease liabilities	15,128
Current lease liabilities	3,900
Operating lease, right-of-use asset	$ 46,400
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued liabilities – other
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities

Basis of Presentation and Significant Accounting Policies - Changes in Carrying Amount of Other Non-Current Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Finance Costs [Roll Forward]
Balance at beginning of period	$ 12,269	$ 8,006	$ 9,583
Additions	4,838	6,803	0
Interest Expense, Debt	6,411	2,540	1,577
Balance at end of period	10,696	12,269	8,006
Amortization of Debt Issuance Costs	(4,212)	(665)	$ 0
Senior Notes Due 2026
Deferred Finance Costs [Roll Forward]
Amortization of Debt Issuance Costs	$ (4,200)
Former Credit Facility
Deferred Finance Costs [Roll Forward]
Amortization of Debt Issuance Costs		$ (700)

Basis of Presentation and Significant Accounting Policies - Asset Retirement Obligations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Asset Retirement Costs, Estimated Maximum Duration	40 years
Asset Retirement Obligation, Adjustment for Business Acquisition, Foreign Currency Translation Gain (Loss)	$ (4,300)
Asset retirement obligations Abstract
Balance at beginning of period	78,110	$ 77,288	$ 90,822
Costs incurred	(215)	(1,608)	(10,380)
Additions/adjustments	0	(3,284)	(5,030)
Acquisitions	0	0	0
Accretion	5,996	5,343	5,379
Translation	241	371	(3,503)
Balance at end of period	84,132	78,110	77,288
Current asset retirement obligation	$ 4,700	$ 2,800	$ 5,700

Basis of Presentation and Significant Accounting Policies - Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives
Stockholders' Equity	$ 637,235	$ 617,768	$ 404,112	$ 235,701
Currency translation adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives
Stockholders' Equity	30,627	24,454
Net unrealized loss on derivative financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives
Stockholders' Equity	(694)
Net unrealized loss on derivative financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives
Stockholders' Equity		(496)
Unrecognized prior service cost on benefit obligations
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives
Stockholders' Equity	(18,022)	(15,902)
Net unrealized gain on available-for-sale investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives
Stockholders' Equity	232	142
Accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives
Stockholders' Equity	$ 12,143	$ 8,198	$ (7,448)	$ (10,289)

- Definition

Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

+ References

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+ Details

Basis of Presentation and Significant Accounting Policies - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenues	$ 591,975	$ 498,727	$ 505,099	$ 528,273	$ 556,910	$ 519,878	$ 504,520	$ 542,208	$ 2,124,074	$ 2,123,516	$ 1,894,920
Cost of operations									(1,573,797)	(1,548,119)	(1,361,056)
Total before tax									395,713	362,172	313,742
Other – net									85,207	34,116	22,599
Provision for Income Taxes									(89,425)	(82,976)	(69,065)
Net income									306,288	279,196	244,677
Accumulated Other Comprehensive Income Component Recognized
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income									(2,597)	(2,045)	(2,918)
Accumulated Other Comprehensive Income Component Recognized \| Realized (loss) gain on derivative financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenues									307
Cost of operations									(712)
Total before tax									(405)
Provision for Income Taxes									103
Net income									(302)
Accumulated Other Comprehensive Income Component Recognized \| Realized (loss) gain on derivative financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenues										(35)	(132)
Cost of operations										695	(1,066)
Total before tax										660	(1,198)
Provision for Income Taxes										(173)	310
Net income										487	(888)
Accumulated Other Comprehensive Income Component Recognized \| Amortization of prior service cost on benefit obligations
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other – net									(2,919)	(3,177)	(2,592)
Provision for Income Taxes									624	645	562
Net income									$ (2,295)	$ (2,532)	$ (2,030)

Acquisitions - Additional Information (Details) $ in Thousands, $ in Millions			12 Months Ended
	Jan. 02, 2020 USD ($)	Jan. 02, 2020 CAD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 CAD ($)	Dec. 31, 2020 USD ($)	Jan. 02, 2020 CAD ($)	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 285,502		$ 283,708		$ 275,502
Laker Energy Products, Ltd
Business Acquisition [Line Items]
Purchase of business	$ 17,800	$ 23.3
Contingent consideration recognized in purchase price						$ 2.5
Intangible assets	8,200
Property, plant and equipment	8,400
Goodwill	5,800
Right-of-use assets	2,700
Lease liabilities	$ 2,700
Recorded gain as a component of cost of operations			$ 2,000	$ 2.5

Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 591,975	$ 498,727	$ 505,099	$ 528,273	$ 556,910	$ 519,878	$ 504,520	$ 542,208	$ 2,124,074	$ 2,123,516	$ 1,894,920
Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									2,153,218	2,154,019	1,912,566
Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(29,144)	(30,503)	(17,646)
Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenues									1,254,195	1,228,348	1,140,394
Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenues									617,007	635,024	518,808
Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenues									177,986	206,799	183,222
Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues									104,030	83,848	70,142
Over time
Disaggregation of Revenue [Line Items]
Revenues									2,101,477	2,105,330	1,864,762
Point-in-time
Disaggregation of Revenue [Line Items]
Revenues									51,741	48,689	47,804
UNITED STATES \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,779,640	1,806,810	1,587,558
UNITED STATES \| Government \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,642,169	1,653,331	1,479,791
UNITED STATES \| Non-Government \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									137,471	153,479	107,767
CANADA \| Non-Government
Disaggregation of Revenue [Line Items]
Revenues									348,829	313,790	290,144
Other \| Non-Government
Disaggregation of Revenue [Line Items]
Revenues									24,749	33,419	34,864
Nuclear Services Group
Disaggregation of Revenue [Line Items]
Revenues									123,538	136,493	131,339
Nuclear Services Group \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									123,538	136,493	131,339
Nuclear Services Group \| Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(22,964)	(26,159)	(13,056)
Nuclear Services Group \| Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenues									0	0	0
Nuclear Services Group \| Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenues									38,151	32,334	26,163
Nuclear Services Group \| Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenues									73,621	94,320	102,726
Nuclear Services Group \| Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues									11,766	9,839	2,450
Nuclear Services Group \| Over time
Disaggregation of Revenue [Line Items]
Revenues									123,538	136,493	131,339
Nuclear Services Group \| Point-in-time
Disaggregation of Revenue [Line Items]
Revenues									0	0	0
Nuclear Services Group \| UNITED STATES \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									120,025	132,136	129,143
Nuclear Services Group \| UNITED STATES \| Government \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									114,465	113,075	111,236
Nuclear Services Group \| UNITED STATES \| Non-Government \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									5,560	19,061	17,907
Nuclear Services Group \| CANADA \| Non-Government \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									3,417	4,357	2,196
Nuclear Services Group \| Other \| Non-Government \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									96	0	0
Nuclear Power Group
Disaggregation of Revenue [Line Items]
Revenues									407,082	371,269	352,640
Nuclear Power Group \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									407,082	371,269	352,640
Nuclear Power Group \| Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(778)	(553)	(208)
Nuclear Power Group \| Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenues									9,279	1,578	2,511
Nuclear Power Group \| Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenues									307,200	296,394	282,014
Nuclear Power Group \| Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenues									0	0	755
Nuclear Power Group \| Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues									90,603	73,297	67,360
Nuclear Power Group \| Over time
Disaggregation of Revenue [Line Items]
Revenues									355,477	322,745	305,075
Nuclear Power Group \| Point-in-time
Disaggregation of Revenue [Line Items]
Revenues									51,605	48,524	47,565
Nuclear Power Group \| UNITED STATES \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									44,102	35,432	38,058
Nuclear Power Group \| UNITED STATES \| Government \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									0	0	0
Nuclear Power Group \| UNITED STATES \| Non-Government \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									44,102	35,432	38,058
Nuclear Power Group \| CANADA \| Non-Government \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									345,412	309,433	287,948
Nuclear Power Group \| Other \| Non-Government \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									17,568	26,404	26,634
Nuclear Operations Group
Disaggregation of Revenue [Line Items]
Revenues									1,622,598	1,646,257	1,428,587
Nuclear Operations Group \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,622,598	1,646,257	1,428,587
Nuclear Operations Group \| Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues									(5,402)	(3,791)	(4,382)
Nuclear Operations Group \| Fixed-Price Incentive Fee
Disaggregation of Revenue [Line Items]
Revenues									1,244,916	1,226,770	1,137,883
Nuclear Operations Group \| Firm-Fixed-Price
Disaggregation of Revenue [Line Items]
Revenues									271,656	306,296	210,631
Nuclear Operations Group \| Cost-Plus Fee
Disaggregation of Revenue [Line Items]
Revenues									104,365	112,479	79,741
Nuclear Operations Group \| Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues									1,661	712	332
Nuclear Operations Group \| Over time
Disaggregation of Revenue [Line Items]
Revenues									1,622,462	1,646,092	1,428,348
Nuclear Operations Group \| Point-in-time
Disaggregation of Revenue [Line Items]
Revenues									136	165	239
Nuclear Operations Group \| UNITED STATES \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,615,513	1,639,242	1,420,357
Nuclear Operations Group \| UNITED STATES \| Government \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									1,527,704	1,540,256	1,368,555
Nuclear Operations Group \| UNITED STATES \| Non-Government \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									87,809	98,986	51,802
Nuclear Operations Group \| CANADA \| Non-Government \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									0	0	0
Nuclear Operations Group \| Other \| Non-Government \| Reportable Segments
Disaggregation of Revenue [Line Items]
Revenues									$ 7,085	$ 7,015	$ 8,230

Revenue Recognition - Additional details (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Net favorable changes in estimates resulting in increased revenues	$ 30.7	$ 44.9	$ 70.9
Increase in cost of operations	4.2	2.1	$ (0.7)
Increase in receivables billed	92.4
Advanced billings revenue recognized	67.5	$ 51.5
Revenue recognized from advance billings on contracts	$ 28.0

Revenue Recognition - Retainages (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2024	Dec. 31, 2023
Revenue from External Customer [Line Items]
Contract with customer asset	$ 546,595	$ 449,176
Contract with customer, liability	111,619	83,581
Advanced billings revenue recognized	67,500	51,500
Contracts in Progress
Revenue from External Customer [Line Items]
Contract with customer asset	528,644	436,279
Accounts Receivable
Revenue from External Customer [Line Items]
Contract with customer asset	51,507	55,172
Other Assets
Revenue from External Customer [Line Items]
Contract with customer asset	$ 1,271	$ 1,488
Other Assets \| Forecast
Revenue from External Customer [Line Items]
Contract with customer asset			$ 1,000	$ 300

Equity Method Investments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Undistributed earnings of equity method investees	$ 39,400,000	$ 26,600,000
Reimbursable costs included in revenues of equity method investees	4,102,900,000	3,851,500,000	$ 3,516,100,000
Provision for income taxes	89,425,000	82,976,000	$ 69,065,000
Investees
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Provision for income taxes	0
Other Assets
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Amounts due from related parties included in other assets	$ 1,600,000	$ 2,500,000

- Definition

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Equity Method Investments - Summary of Combined Balance Sheet Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Current assets	$ 773,732	$ 773,598
TOTAL	2,501,380	2,293,503
Current liabilities	459,615	529,727
Stockholders' Equity	637,235	617,768	$ 404,112	$ 235,701
TOTAL	2,501,380	2,293,503
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Current assets	546,233	492,025
Noncurrent assets	634	970
TOTAL	546,867	492,995
Current liabilities	284,821	270,536
Stockholders' Equity	262,046	222,459
TOTAL	$ 546,867	$ 492,995

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Equity Method Investments - Summary of Combined Income Statement Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Net income	$ 306,288	$ 279,196	$ 244,677
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Revenues	4,254,635	3,980,066	3,716,548
Gross profit	159,935	142,709	133,170
Net income	$ 156,994	$ 139,988	$ 130,949

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Equity Method Investments - Reconciliation of Net Income to Equity in Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Equity income based on stated ownership percentages	$ 31,870				$ 27,266				$ 31,870	$ 27,266	$ 28,272
Timing of GAAP and other adjustments	1,628				(114)				1,628	(114)	652
Equity in income of investees	$ 7,301	$ 10,618	$ 7,263	$ 8,316	$ 7,905	$ 8,271	$ 4,913	$ 6,063	$ 33,498	$ 27,152	$ 28,924

Equity Method Investments - Schedule of Transactions with Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Sales to	$ 11,838	$ 12,186	$ 14,668
Dividends received	20,475	25,005	20,955
Capital contributions, net of returns	$ 0	$ (88)	$ (255)

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Valuation allowance for deferred tax asset	$ 13,218	$ 12,892
Net operating loss carryforwards, valuation allowance	9,300
Undistributed earnings of subsidiaries	248,900
Unrecognized deferred income tax liabilities	12,400
Federal
Income Tax Contingency [Line Items]
Federal capital losses	9,300
Net operating loss carryforwards, valuation allowance	3,900
Net operating loss carryforwards	4,900
State
Income Tax Contingency [Line Items]
Net operating loss carryforwards, valuation allowance	4,900
Net operating loss carryforwards	$ 6,100

Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	$ 5,852	$ 3,899	$ 274
Increases based on tax positions taken in the current year	964	2,075	3,736
Increases based on tax positions taken in the prior years	0	0	0
Decreases based on tax positions taken in the prior years	0	0	0
Decreases due to settlements with tax authorities	(6,775)	0	0
Decreases due to lapse of applicable statute of limitation	(41)	(123)	(127)
Other, net	0	1	16
Balance at end of period	$ 0	$ 5,852	$ 3,899

Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Pension liability	$ 12,047	$ 31,152
Accrued warranty expense	1,363	1,338
Accrued vacation pay	7,633	7,442
Accrued liabilities for self-insurance (including postretirement health care benefits)	2,095	2,602
Accrued liabilities for executive and employee incentive compensation	10,733	13,312
Environmental and products liabilities	21,050	20,261
Lease liabilities	3,667	2,155
Investments in joint ventures and affiliated companies	2,283	1,148
Long-term contracts	21,562	15,974
Accrued payroll taxes	4,753	4,828
U.S. federal tax credits and loss carryforward	7,023	7,224
U.S. state tax credits and loss carryforward	4,866	6,819
Foreign tax credit and loss carryforward	16,477	9,919
Other	2,568	4,961
Total deferred tax assets	118,120	129,135
Valuation allowance for deferred tax assets	(13,218)	(12,892)
Deferred tax assets	104,902	116,243
Deferred tax liabilities:
Property, plant and equipment	66,636	39,315
Right-of-use lease assets	11,666	10,509
Intangibles	16,365	17,004
Total deferred tax liabilities	94,667	66,828
Net deferred tax assets	$ 10,235	$ 49,415

Income Taxes - Income from Continuing Operations Before Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
U.S.	$ 343,091	$ 314,150	$ 270,569
Other than U.S.	52,622	48,022	43,173
Total before tax	$ 395,713	$ 362,172	$ 313,742

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123384075&loc=d3e41242-110953

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(10))
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(8))
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(2))
-URI http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8924-108599

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(15))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

+ Details

Income Taxes - Components of Income Tax Provision from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
U.S. – federal	$ 31,535	$ 53,340	$ 47,693
U.S. – state and local	1,030	7,587	2,180
Other than U.S.	16,769	14,159	15,398
Total current	49,334	75,086	65,271
Deferred:
U.S. – federal	40,463	10,852	7,975
U.S. – state and local	3,473	(536)	872
Other than U.S.	(3,845)	(2,426)	(5,053)
Total deferred	40,091	7,890	3,794
Provision for Income Taxes	$ 89,425	$ 82,976	$ 69,065

Income Taxes - Reconciliation of the Income Tax Provision Related to Continuing Operations from the U.S. Statutory Federal Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
U.S. federal statutory tax rate	21.00%	21.00%	21.00%
State and local income taxes	1.10%	1.90%	1.00%
Foreign rate differential	0.60%	0.60%	0.60%
Excess tax deductions on equity compensation	(0.10%)	(0.30%)	(0.70%)
Other	0.00%	(0.30%)	0.10%
Effective tax rate	22.60%	22.90%	22.00%

Income Taxes - Valuation Allowance for Deferred Tax Assets (Detail) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	$ (12,892)	$ (13,578)	$ (13,257)
Charges To Costs and Expenses	(326)	771	(414)
Charged To Other Accounts	0	(85)	93
Ending Balance	$ (13,218)	$ (12,892)	$ (13,578)

Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-Term Debt, gross	$ 1,200,000	$ 875,000
Less: Deferred debt issuance costs	10,696	12,269	$ 8,006	$ 9,583
Long-Term Debt	1,189,304	862,731
Senior Notes \| Secured Debt
Debt Instrument [Line Items]
Long-term debt including current maturities	800,000	800,000
Credit Facility \| Secured Debt
Debt Instrument [Line Items]
Long-term debt including current maturities	$ 400,000	$ 75,000

Long-Term Debt - Additional Information (Detail)					3 Months Ended	12 Months Ended
Long-Term Debt - Additional Information (Detail)	Jul. 15, 2021 USD ($)	Apr. 13, 2021 USD ($)	Jun. 12, 2020 USD ($)	May 24, 2018 USD ($) fiscalQuarter	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Mar. 24, 2020 USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
Maturity of long-term debt, 2022						$ 0
Maturity of long-term debt, 2023						0
Maturity of long-term debt, 2024						0
Maturity of long-term debt, 2025						400,000,000
Maturity of long-term debt, 2026						0
Maturities of long-term debt, thereafter						800,000,000
Bonds issued and outstanding						109,500,000
Write-off of deferred financing costs					$ 4,200,000
Senior Notes \| Secured Debt
Long-term Debt, Fiscal Year Maturity [Abstract]
Long-term debt, senior notes				$ 400,000,000
Credit Facility
Long-term Debt, Fiscal Year Maturity [Abstract]
Aggregate amount to be borrowed to meet letter of credit requirements						$ 313,800,000
Interest rate on borrowings						1.61%
Credit Facility \| Prime Rate or Canadian Prime Rate \| Minimum
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt instrument, basis spread on variable rate				0.00%
Credit Facility \| Prime Rate or Canadian Prime Rate \| Maximum
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt instrument, basis spread on variable rate				0.75%
Credit Facility \| Base Rate
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt instrument, basis spread on variable rate						0.50%
Credit Facility \| Eurocurrency Rate
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt instrument, basis spread on variable rate						1.50%
Credit Facility \| Eurocurrency Rate \| Minimum
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt instrument, basis spread on variable rate				1.00%
Credit Facility \| Eurocurrency Rate \| Maximum
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt instrument, basis spread on variable rate						1.75%
Credit Facility \| Secured Debt
Long-term Debt, Fiscal Year Maturity [Abstract]
Increase in maximum borrowing capacity under certain conditions				$ 250,000,000
Line of credit facility covenant, percentage of EBITDA				65.00%
Maximum leverage ratio required for future credit increase				2.50
Number of fiscal quarters \| fiscalQuarter				4
Maximum leverage ratio				4.00
Maximum leverage ration after material acquisition				4.50
Minimum interest coverage ratio				3.00
Credit Facility \| Performance Letter of Credit \| Minimum
Long-term Debt, Fiscal Year Maturity [Abstract]
Letter of credit fee				0.75%
Credit Facility \| Performance Letter of Credit \| Maximum
Long-term Debt, Fiscal Year Maturity [Abstract]
Letter of credit fee				1.05%
Credit Facility \| Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Commitment fee on unused portions of credit agreement, variable range						0.20%
Credit facility, aggregate borrowings outstanding						$ 400,000,000
Credit Facility \| Senior Notes \| Minimum
Long-term Debt, Fiscal Year Maturity [Abstract]
Commitment fee on unused portions of credit agreement, variable range				0.15%
Credit Facility \| Senior Notes \| Maximum
Long-term Debt, Fiscal Year Maturity [Abstract]
Commitment fee on unused portions of credit agreement, variable range				0.225%
Credit Facility \| Letter of Credit
Long-term Debt, Fiscal Year Maturity [Abstract]
Credit facility, aggregate borrowings outstanding						$ 36,200,000
Credit Facility \| Letter of Credit \| Minimum
Long-term Debt, Fiscal Year Maturity [Abstract]
Letter of credit fee				1.00%
Credit Facility \| Letter of Credit \| Maximum
Long-term Debt, Fiscal Year Maturity [Abstract]
Letter of credit fee				1.75%
Credit Facility \| Letter of Credit \| Base Rate
Long-term Debt, Fiscal Year Maturity [Abstract]
Letter of credit fee						0.90%
Credit Facility \| Letter of Credit \| Eurocurrency Rate
Long-term Debt, Fiscal Year Maturity [Abstract]
Letter of credit fee						1.50%
Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Stated interest rate percentage of senior notes				5.375%
Senior Notes Due 2028 \| Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Long-term debt, senior notes			$ 400,000,000
Stated interest rate percentage of senior notes			4.125%
Redemption price percentage			100.00%
Amendment No. 1 to Credit Agreement \| Senior Notes \| Secured Debt
Long-term Debt, Fiscal Year Maturity [Abstract]
Credit agreement, maximum borrowing capacity							$ 750,000,000
Senior Notes Due 2026 \| Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Premium for early redemption of senior notes	$ 10,800,000
Write-off of deferred financing costs	$ 4,200,000
Senior Notes Due 2029 \| Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Long-term debt, senior notes		$ 400,000,000
Stated interest rate percentage of senior notes		4.125%
Debt Instrument, Redemption, Period One \| Senior Notes Due 2028 \| Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Percentage of principal redeemable			40.00%
Redemption price percentage			104.125%
Debt Instrument, Redemption, Period One \| Senior Notes Due 2029
Long-term Debt, Fiscal Year Maturity [Abstract]
Redemption price percentage		100.00%
Debt Instrument, Redemption, Period One \| Senior Notes Due 2029 \| Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Percentage of principal redeemable		40.00%
Redemption price percentage		104.125%
Debt Instrument, Redemption, Period Two \| Senior Notes Due 2028 \| Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Redemption price percentage			102.063%
Debt Instrument, Redemption, Period Two \| Senior Notes Due 2029 \| Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Redemption price percentage		102.063%
Debt Instrument, Redemption, Period Three \| Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Redemption price percentage						102.688%
Debt Instrument, Redemption, Period Three \| Senior Notes Due 2028 \| Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Redemption price percentage			101.031%
Debt Instrument, Redemption, Period Three \| Senior Notes Due 2029 \| Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Redemption price percentage		101.031%
Debt Instrument, Redemption, Period Four \| Senior Notes Due 2028 \| Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Redemption price percentage			100.00%
Debt Instrument, Redemption, Period Four \| Senior Notes Due 2029 \| Senior Notes
Long-term Debt, Fiscal Year Maturity [Abstract]
Redemption price percentage		100.00%

Pension Plans and Postretirement Benefits - Obligations and Funded Status (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in benefit obligation:
Service cost				$ 12,400	$ 11,300	$ 9,700
Settlements	$ (38,300)
Actuarial loss (gain)		$ (39,600)	$ 6,400
Change in plan assets:
Balance at beginning of period				1,333,309
Company contributions				6,164
Balance at end of period	1,310,311	1,310,311	1,333,309	1,310,311	1,333,309
Amounts recognized in the balance sheet consist of:
Accumulated postretirement benefit obligation	(24,333)	(24,333)	(25,689)	(24,333)	(25,689)
Pension liability	(59,388)	(59,388)	(144,859)	(59,388)	(144,859)
Pension Plan
Change in benefit obligation:
Benefit obligation at beginning of period				1,414,055	1,308,798
Service cost				11,667	10,650	9,123
Interest cost				27,170	37,199	46,307
Plan participants' contributions				199	180
Amendments				2,314	2,333
Settlements				(38,330)	(7,041)
Actuarial loss (gain)				(45,476)	120,126
Foreign currency exchange rate changes				1,669	3,513
Benefits paid				(65,002)	(61,703)
Benefit obligation at end of period	1,308,266	1,308,266	1,414,055	1,308,266	1,414,055	1,308,798
Change in plan assets:
Balance at beginning of period				1,281,232	1,150,495
Actual return on plan assets				72,030	190,862
Plan participants' contributions				199	180
Company contributions					5,131
Settlements				(39,439)	(7,041)
Foreign currency exchange rate changes				1,615	3,308
Benefits paid				(65,002)	(61,703)
Balance at end of period	1,256,799	1,256,799	1,281,232	1,256,799	1,281,232	1,150,495
Funded status	(51,467)	(51,467)	(132,823)	(51,467)	(132,823)
Amounts recognized in the balance sheet consist of:
Prepaid pension	10,573	10,573	14,588	10,573	14,588
Accrued employee benefits	(3,125)	(3,125)	(3,082)	(3,125)	(3,082)
Accumulated postretirement benefit obligation	0	0	0	0	0
Pension liability	(58,915)	(58,915)	(144,329)	(58,915)	(144,329)
Accrued benefit liability, net	(51,467)	(51,467)	(132,823)	(51,467)	(132,823)
Amount recognized in accumulated comprehensive income (before taxes):
Prior service cost (credit)	20,536	20,536	21,319	20,536	21,319
Plans with accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	1,172,881	1,172,881	1,264,764	1,172,881	1,264,764
Accumulated benefit obligation	1,166,855	1,166,855	1,255,899	1,166,855	1,255,899
Fair value of plan assets	1,110,841	1,110,841	1,117,353	1,110,841	1,117,353
Plans with plan assets in excess of accumulated benefit obligation:
Projected benefit obligation	135,385	135,385	149,291	135,385	149,291
Accumulated benefit obligation	135,375	135,375	149,270	135,375	149,270
Fair value of plan assets	145,958	145,958	163,879	145,958	163,879
Other Benefits
Change in benefit obligation:
Benefit obligation at beginning of period				61,086	58,881
Service cost				760	642	545
Interest cost				1,197	1,612	2,254
Plan participants' contributions				488	562
Amendments				3,402	0
Settlements				0	0
Actuarial loss (gain)				(4,944)	2,219
Foreign currency exchange rate changes				197	331
Benefits paid				(2,885)	(3,161)
Benefit obligation at end of period	59,301	59,301	61,086	59,301	61,086	58,881
Change in plan assets:
Balance at beginning of period				52,077	48,321
Actual return on plan assets				2,898	5,293
Plan participants' contributions				488	562
Company contributions				1,008	992
Settlements				0	0
Foreign currency exchange rate changes				0	0
Benefits paid				(2,959)	(3,091)
Balance at end of period	53,512	53,512	52,077	53,512	52,077	$ 48,321
Funded status	(5,789)	(5,789)	(9,009)	(5,789)	(9,009)
Amounts recognized in the balance sheet consist of:
Prepaid pension	20,122	20,122	18,069	20,122	18,069
Accrued employee benefits	(1,578)	(1,578)	(1,389)	(1,578)	(1,389)
Accumulated postretirement benefit obligation	(24,333)	(24,333)	(25,689)	(24,333)	(25,689)
Pension liability	0	0	0	0	0
Accrued benefit liability, net	(5,789)	(5,789)	(9,009)	(5,789)	(9,009)
Amount recognized in accumulated comprehensive income (before taxes):
Prior service cost (credit)	2,520	2,520	(1,059)	2,520	(1,059)
Plans with accumulated benefit obligation in excess of plan assets:
Accumulated benefit obligation	23,503	23,503	24,593	23,503	24,593
Fair value of plan assets	0	0	0	0	0
Plans with plan assets in excess of accumulated benefit obligation:
Accumulated benefit obligation	35,798	35,798	36,493	35,798	36,493
Fair value of plan assets	$ 53,512	$ 53,512	$ 52,077	$ 53,512	$ 52,077

Pension Plans and Postretirement Benefits - Additional Information (Detail) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2021 USD ($) retiree	Dec. 31, 2021 USD ($) retiree	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 12,400	$ 11,300	$ 9,700
Other components of net periodic benefit cost		(92,900)	$ (31,600)	(17,500)
Pension settlement related charges	$ 38,300
Company contributions		6,164
Other comprehensive loss as components of net periodic benefit cost for pension benefit in the current fiscal year		$ 3,100
Percentage of investment return on domestic plan assets		9.00%	19.00%
Liability for group annuity contract	$ 45,600	$ 45,600
Vesting period for employer matching contributions		3 years
Other comprehensive income as components of net periodic benefit cost for other benefit in the current fiscal year		$ (200)
Number of retirees transferred to annuity contract \| retiree	400	400
Pension settlement charges		$ 1,100
Thrift Plan
Defined Benefit Plan Disclosure [Line Items]
Percentage of matching contribution by employer		50.00%
Thrift Plan \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Employer matching percentage		6.00%
Thrift Plan and MII Thrift Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		$ 37,500	$ 35,800	31,700
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost		11,667	10,650	$ 9,123
Increase in pension plan benefit obligation		(43,000)	124,200
Pension settlement related charges		$ 38,330	7,041
Company contributions			$ 5,131
Expected return on plan assets		6.80%	6.95%	6.95%

Pension Plans and Postretirement Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 12,400	$ 11,300	$ 9,700
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	11,667	10,650	9,123
Interest cost	27,170	37,199	46,307
Expected return on plan assets	(81,778)	(77,298)	(69,809)
Amortization of prior service cost	3,097	3,370	2,903
Recognized net actuarial loss (gain)	(34,690)	6,829	9,353
Net periodic benefit cost (income)	(74,534)	(19,250)	(2,123)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	760	642	545
Interest cost	1,197	1,612	2,254
Expected return on plan assets	(2,891)	(2,691)	(2,514)
Amortization of prior service cost	(178)	(193)	(311)
Recognized net actuarial loss (gain)	(4,876)	(458)	(5,723)
Net periodic benefit cost (income)	$ (5,988)	$ (1,088)	$ (5,749)

Pension Plans and Postretirement Benefits - Summary of Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Pension Plan
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Decrease in accumulated other comprehensive income due to actuarial losses – before taxes	$ (2,314)	$ (2,333)
Other Benefits
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Decrease in accumulated other comprehensive income due to actuarial losses – before taxes	$ (3,402)	$ 0

Pension Plans and Postretirement Benefits - Weighted Average Assumptions (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	2.91%	2.63%
Discount rate to determine interest cost	1.96%	2.78%	3.98%
Expected return on plan assets	6.80%	6.95%	6.95%
Other Benefits
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	2.85%	2.49%
Discount rate to determine interest cost	1.87%	2.62%	3.92%
Expected return on plan assets	5.66%	5.66%	5.68%

Pension Plans and Postretirement Benefits - Assumed Health Care Cost Trend Rates (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Health care cost trend rate assumed for next year	7.50%	6.75%
Rates to which the cost trend rate is assumed to decline (ultimate trend rate)	4.50%	4.50%
Year that the rate reaches ultimate trend rate	2034	2030

Pension Plans and Postretirement Benefits - Plan Asset Allocations by Asset Category (Detail)	Dec. 31, 2021	Dec. 31, 2020
UNITED STATES \| Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Total	100.00%	100.00%
UNITED STATES \| Pension Plan \| Commingled and Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Total	29.00%	29.00%
UNITED STATES \| Pension Plan \| U.S. Government Securities
Defined Benefit Plan Disclosure [Line Items]
Total	32.00%	28.00%
UNITED STATES \| Pension Plan \| Fixed Income (excluding U.S. Government Securities)
Defined Benefit Plan Disclosure [Line Items]
Total	11.00%	18.00%
UNITED STATES \| Pension Plan \| Diversified Credit
Defined Benefit Plan Disclosure [Line Items]
Total	11.00%	11.00%
UNITED STATES \| Pension Plan \| Real Estate
Defined Benefit Plan Disclosure [Line Items]
Total	11.00%	7.00%
UNITED STATES \| Pension Plan \| Partnerships with Security Holdings
Defined Benefit Plan Disclosure [Line Items]
Total	4.00%	4.00%
UNITED STATES \| Pension Plan \| Other
Defined Benefit Plan Disclosure [Line Items]
Total	2.00%	3.00%
CANADA \| Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Total	100.00%	100.00%
CANADA \| Other Benefits \| Equity Securities and Commingled Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Total	11.00%	0.00%
CANADA \| Other Benefits \| Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Total	20.00%	98.00%
CANADA \| Other Benefits \| Other
Defined Benefit Plan Disclosure [Line Items]
Total	69.00%	2.00%

Pension Plans and Postretirement Benefits - Target Allocation by Asset Class (Detail) - Pension Plan	Dec. 31, 2021
UNITED STATES \| Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Target allocation by asset class	45.00%
UNITED STATES \| Equities
Defined Benefit Plan Disclosure [Line Items]
Target allocation by asset class	28.00%
UNITED STATES \| Other
Defined Benefit Plan Disclosure [Line Items]
Target allocation by asset class	27.00%
CANADA \| Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Target allocation by asset class	20.00%
CANADA \| Equities
Defined Benefit Plan Disclosure [Line Items]
Target allocation by asset class	11.00%
CANADA \| Other
Defined Benefit Plan Disclosure [Line Items]
Target allocation by asset class	69.00%

Pension Plans and Postretirement Benefits - Summary of Total Investments Measured at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Separate Account Investment [Line Items]
Total Assets	$ 1,310,311	$ 1,333,309
Unclassified	655,149	715,313
Fixed Income
Fair Value, Separate Account Investment [Line Items]
Total Assets	182,169	391,418
Unclassified	21,484	162,561
Commingled and Mutual Funds
Fair Value, Separate Account Investment [Line Items]
Total Assets	358,423	338,473
Unclassified	280,743	265,709
U.S. Government Securities
Fair Value, Separate Account Investment [Line Items]
Total Assets	369,980	316,375
Unclassified	0	0
Other
Fair Value, Separate Account Investment [Line Items]
Total Assets	133,508	126,823
Unclassified	133,508	126,823
Real Estate
Fair Value, Separate Account Investment [Line Items]
Total Assets	126,886	77,437
Unclassified	126,886	77,437
Partnerships with Security Holdings
Fair Value, Separate Account Investment [Line Items]
Total Assets	46,515	49,007
Unclassified	46,515	49,007
Cash, Cash Equivalents and Accrued Items (2)
Fair Value, Separate Account Investment [Line Items]
Total Assets	46,013	33,776
Unclassified	46,013	33,776
Investment Contracts
Fair Value, Separate Account Investment [Line Items]
Total Assets	46,817
Unclassified	0
Level 1
Fair Value, Separate Account Investment [Line Items]
Total Assets	474,831	383,739
Level 1 \| Fixed Income
Fair Value, Separate Account Investment [Line Items]
Total Assets	31,856	0
Level 1 \| Commingled and Mutual Funds
Fair Value, Separate Account Investment [Line Items]
Total Assets	77,680	72,764
Level 1 \| U.S. Government Securities
Fair Value, Separate Account Investment [Line Items]
Total Assets	365,295	310,975
Level 1 \| Other
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	0
Level 1 \| Real Estate
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	0
Level 1 \| Partnerships with Security Holdings
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	0
Level 1 \| Cash, Cash Equivalents and Accrued Items (2)
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	0
Level 1 \| Investment Contracts
Fair Value, Separate Account Investment [Line Items]
Total Assets	0
Level 2
Fair Value, Separate Account Investment [Line Items]
Total Assets	133,514	234,257
Level 2 \| Fixed Income
Fair Value, Separate Account Investment [Line Items]
Total Assets	128,829	228,857
Level 2 \| Commingled and Mutual Funds
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	0
Level 2 \| U.S. Government Securities
Fair Value, Separate Account Investment [Line Items]
Total Assets	4,685	5,400
Level 2 \| Other
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	0
Level 2 \| Real Estate
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	0
Level 2 \| Partnerships with Security Holdings
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	0
Level 2 \| Cash, Cash Equivalents and Accrued Items (2)
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	0
Level 2 \| Investment Contracts
Fair Value, Separate Account Investment [Line Items]
Total Assets	0
Level 3
Fair Value, Separate Account Investment [Line Items]
Total Assets	46,817	0
Level 3 \| Fixed Income
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	0
Level 3 \| Commingled and Mutual Funds
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	0
Level 3 \| U.S. Government Securities
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	0
Level 3 \| Other
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	0
Level 3 \| Real Estate
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	0
Level 3 \| Partnerships with Security Holdings
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	0
Level 3 \| Cash, Cash Equivalents and Accrued Items (2)
Fair Value, Separate Account Investment [Line Items]
Total Assets	0	$ 0
Level 3 \| Investment Contracts
Fair Value, Separate Account Investment [Line Items]
Total Assets	$ 46,817

Pension Plans and Postretirement Benefits - Plans' Level 3 Instruments Reconciliation (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Fair Value, Separate Account Investment [Line Items]
Balance at beginning of period	$ 1,333,309
Balance at end of period	1,310,311
Level 3
Fair Value, Separate Account Investment [Line Items]
Balance at beginning of period	0
Purchases	45,645
Unrealized gain	652
Foreign currency exchange rate changes	520
Balance at end of period	$ 46,817

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References + Details

Pension Plans and Postretirement Benefits - Cash Flows (Detail) $ in Thousands	Dec. 31, 2021 USD ($)
UNITED STATES \| Pension Plan
Expected employer contributions to trusts of defined benefit plans:
Expected benefit payments, 2020	$ 0
Expected benefit payments:
Expected benefit payments, 2020	61,599
Expected benefit payments, 2021	63,669
Expected benefit payments, 2022	65,271
Expected benefit payments, 2023	66,406
Expected benefit payments, 2024	67,253
Expected benefit payments, 2025-2029	337,288
UNITED STATES \| Other Benefits
Expected employer contributions to trusts of defined benefit plans:
Expected benefit payments, 2020	90
Expected benefit payments:
Expected benefit payments, 2020	2,924
Expected benefit payments, 2021	2,914
Expected benefit payments, 2022	2,959
Expected benefit payments, 2023	2,914
Expected benefit payments, 2024	2,855
Expected benefit payments, 2025-2029	12,881
CANADA
Expected employer contributions to trusts of defined benefit plans:
Expected benefit payments, 2020	10,579
CANADA \| Pension Plan
Expected benefit payments:
Expected benefit payments, 2020	3,588
Expected benefit payments, 2021	3,802
Expected benefit payments, 2022	4,009
Expected benefit payments, 2023	4,212
Expected benefit payments, 2024	4,390
Expected benefit payments, 2025-2029	24,724
CANADA \| Other Benefits
Expected benefit payments:
Expected benefit payments, 2020	526
Expected benefit payments, 2021	547
Expected benefit payments, 2022	557
Expected benefit payments, 2023	586
Expected benefit payments, 2024	639
Expected benefit payments, 2025-2029	$ 3,404

Capital Stock - Additional Information (Detail) - USD ($)		12 Months Ended
	Nov. 06, 2018	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Apr. 30, 2021
Capital Stock [Line Items]
Common stock repurchased		$ 230,828,000	$ 27,288,000	$ 30,369,000
Share Repurchase Program
Capital Stock [Line Items]
Additional common stock at an aggregate purchase price	$ 250,000,000	$ 225,800,000	$ 22,000,000
Stock repurchase program, term	3 years
Common stock at an aggregate authorized purchase price					$ 500,000,000
Common stock repurchased (shares)		4,134,767	338,521	443,877
Common stock repurchased				$ 20,000,000
Stock repurchase program, remaining authorized repurchase amount		$ 417,600,000

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		12 Months Ended
	May 31, 2020	Jun. 30, 2012	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2014	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense			$ 18.3	$ 16.8	$ 14.8
Stock-based compensation, tax benefits			$ 3.0	2.7	2.5
Performance period			3 years
BWXT Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of stock options exercised			$ 2.7	$ 4.7	$ 8.1
Tax benefits realized related to the stock options exercised			0.3
BWXT Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefits realized related to the stock options exercised			$ 1.0
Nonvested cash-settled performance units (shares)			545,000	451,000
BWXT Performance Shares \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage			0.00%
BWXT Performance Shares \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage			200.00%
BWXT Performance Shares \| Weighted Average
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage			129.00%
BWXT Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefits realized related to the stock options exercised			$ 1.1
Nonvested cash-settled performance units (shares)			221,000	185,000
Cash Settled Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested cash-settled performance units (shares)			3,973
Nonvested cash-settled performance units value per share			$ 47.88
Nonvested cash-settled performance units assumed weighted average vesting			128.00%
Cash Settled Performance Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage			0.00%
Cash Settled Performance Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage			200.00%
Cash Settled Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested cash-settled performance units (shares)			1,715
Nonvested cash-settled performance units value per share			$ 47.88
2010 Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized for issuance (shares)						2,300,000
Number of shares authorized for issuance (shares)							10,000,000
Minimum percentage of fair market value closing price						100.00%
Expiry date of common stock grants						10 years
Shares available for issuance of awards in future (shares)			4,036,598
2012 Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum percentage of fair market value closing price		100.00%
Expiry date of common stock grants		10 years
Total unrecognized estimated compensation expense, nonvested awards			$ 14.8
Unrecognized estimated compensation expense to be recognized, weighted-average period			1 year 7 months 6 days
2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized for issuance (shares)	1,450,000
Minimum percentage of fair market value closing price	100.00%
Expiry date of common stock grants	10 years

Stock-Based Compensation - Summarized Activity of Stock Options (Detail) - BWXT Stock Options $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period (shares)	201
Granted (shares)	0
Exercised (shares)	(76)
Cancelled/expired/forfeited (shares)	0
Outstanding at end of period (shares)	125
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period (USD per share) \| $ / shares	$ 24.07
Exercised (USD per share) \| $ / shares	24.77
Outstanding at end of period (USD per share) \| $ / shares	$ 23.65
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding at end of period, weighted-average remaining contractual term (in years)	3 years 2 months 12 days
Outstanding at end of period, aggregate intrinsic value \| $	$ 3.0
Exercisable at end of period, Number of options (shares)	125
Exercisable at end of period, weighted-average exercise price (USD per share) \| $ / shares	$ 23.65
Exercisable at end of period, weighted-average remaining contractual term	3 years 2 months 12 days
Exercisable at end of period, aggregate intrinsic value \| $	$ 3.0

Stock-Based Compensation - Schedule of Changes in Nonvested Stock Awards (Detail) shares in Thousands	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Vested, weighted-average grant date fair value (USD per share) \| $ / shares	$ 63.81
BWXT Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at beginning of period (shares) \| shares	451
Adjustment to assumed vesting percentage (shares) \| shares	52
Granted (shares) \| shares	159
Vested (shares) \| shares	(104)
Cancelled/forfeited (shares) \| shares	(13)
Nonvested at end of period (shares) \| shares	545
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested at beginning of period, weighted-average grant date fair value (USD per share) \| $ / shares	$ 56.15
Adjustment to assumed vesting percentage, weighted-average grant date fair value (USD per share) \| $ / shares	58.51
Granted, weighted-average grant date fair value (USD per share) \| $ / shares	59.39
Cancelled/forfeited, weighted-average grant date fair value (USD per share) \| $ / shares	56.23
Nonvested at end of period, weighted-average grant date fair value (USD per share) \| $ / shares	$ 55.90
BWXT Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at beginning of period (shares) \| shares	185
Granted (shares) \| shares	150
Vested (shares) \| shares	(107)
Cancelled/forfeited (shares) \| shares	(7)
Nonvested at end of period (shares) \| shares	221
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested at beginning of period, weighted-average grant date fair value (USD per share) \| $ / shares	$ 55.96
Granted, weighted-average grant date fair value (USD per share) \| $ / shares	60.29
Vested, weighted-average grant date fair value (USD per share) \| $ / shares	58.45
Cancelled/forfeited, weighted-average grant date fair value (USD per share) \| $ / shares	57.09
Nonvested at end of period, weighted-average grant date fair value (USD per share) \| $ / shares	$ 57.66

Stock-Based Compensation - Schedule of Summarized Activity of Stock Appreciation (Detail) - Stock Appreciation Rights $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period (shares)	40
Granted (shares)	0
Exercised (shares)	(13)
Cancelled/expired/forfeited (shares)	0
Outstanding at end of period (shares)	27
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period (USD per share) \| $ / shares	$ 24.04
Exercised (USD per share) \| $ / shares	24.97
Outstanding at end of period (USD per share) \| $ / shares	$ 23.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding at end of period, weighted-average remaining contractual term (in years)	3 years 2 months 12 days
Outstanding at end of period, aggregate intrinsic value \| $	$ 0.7
Exercisable at end of period, Number of options (shares)	27
Exercisable at end of period, weighted-average exercise price (USD per share) \| $ / shares	$ 23.62
Exercisable at end of period, weighted-average remaining contractual term	3 years 2 months 12 days
Exercisable at end of period, aggregate intrinsic value \| $	$ 0.7

Commitments and Contingencies - Additional Information (Detail) - Environmental Matters $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) facility	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Contingencies And Commitments [Line Items]
Pretax charge to comply U.S. federal, state and local environmental control and protection regulations	$ 17.5	$ 16.3	$ 15.9
Capital expenditure to comply environmental regulations	3.1	1.2	$ 1.4
Environmental reserves	102.4	91.3
Environmental reserves included in current liabilities	$ 9.8	7.1
Nuclear Operations Group
Contingencies And Commitments [Line Items]
Number of facilities \| facility	2
Financial assurance to pay expected cost of decommissioning	$ 61.8
Nuclear Energy Group
Contingencies And Commitments [Line Items]
Financial assurance to pay expected cost of decommissioning	$ 46.4	$ 47.9

Financial Instruments with Concentrations of Credit Risk - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Allowance for doubtful accounts receivable	$ 0.2	$ 0.2
Government Contracts Concentration Risk \| Sales Revenue, Net \| U.S. Government
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk percentage	76.00%	77.00%	77.00%
Customer Concentration Risk \| Accounts Receivable \| U.S. Government
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk percentage	68.00%	83.00%

Investments - Summary of Available for Sale Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Total
Total, amortized cost	$ 11,409	$ 10,806
Total, gross unrealized gains	2,023	2,320
Total, gross unrealized losses	(63)	(63)
Total, estimated fair value	13,369	13,063
Equities
Equity securities
Equity securities, amortized cost		172
Equity securities, gross unrealized gains		628
Equity securities, gross unrealized losses		0
Equity securities, estimated fair value		800
Mutual funds
Equity securities
Equity securities, amortized cost	6,001	5,323
Equity securities, gross unrealized gains	1,649	1,432
Equity securities, gross unrealized losses	0	0
Equity securities, estimated fair value	7,650	6,755
U.S. Government and agency securities
Available-for-sale securities
Available-for-sale securities, amortized cost	2,742	2,317
Available-for-sale securities, gross unrealized gains	0	1
Available-for-sale securities, gross unrealized losses	(4)	(4)
Available-for-sale securities, estimated fair value	2,738	2,314
Corporate bonds
Available-for-sale securities
Available-for-sale securities, amortized cost	2,559	2,879
Available-for-sale securities, gross unrealized gains	374	259
Available-for-sale securities, gross unrealized losses	(7)	(6)
Available-for-sale securities, estimated fair value	2,926	3,132
Asset-backed securities and collateralized mortgage obligations
Available-for-sale securities
Available-for-sale securities, amortized cost	107	115
Available-for-sale securities, gross unrealized gains	0	0
Available-for-sale securities, gross unrealized losses	(52)	(53)
Available-for-sale securities, estimated fair value	$ 55	$ 62

Fair Value Measurements - Summary of Investments and Available-for-Sale Securities Measured at Fair Value (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 13,369	$ 13,063
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	4,590	4,052
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	8,779	8,211
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	800
Equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		800
Equities \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0
Equities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0
Equities \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		800
Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	7,650
Available-for-sale securities		6,755
Mutual funds \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0
Available-for-sale securities		0
Mutual funds \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	7,650
Available-for-sale securities		6,755
Mutual funds \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0
Available-for-sale securities		0
U.S. Government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,738	2,314
U.S. Government and agency securities \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,738	2,314
U.S. Government and agency securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
U.S. Government and agency securities \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,926	3,132
Corporate bonds \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,852	1,738
Corporate bonds \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,074	1,394
Corporate bonds \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Asset-backed securities and collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	55	62
Asset-backed securities and collateralized mortgage obligations \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Asset-backed securities and collateralized mortgage obligations \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	55	62
Asset-backed securities and collateralized mortgage obligations \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 0	$ 0

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Senior Notes \| Senior Notes Due 2026
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior notes		$ 415.5
Senior Notes \| Senior Notes Due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior notes	$ 406.3	416.7
Senior Notes \| Senior Notes Due 2029
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior notes	406.5
Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of foreign currency forward contracts	$ (3.2)	$ (2.2)

Segment Reporting - Schedule of Operating Results by Segment (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of reportable segments \| segment									3
Revenues	$ 591,975	$ 498,727	$ 505,099	$ 528,273	$ 556,910	$ 519,878	$ 504,520	$ 542,208	$ 2,124,074	$ 2,123,516	$ 1,894,920
Operating income	102,215	87,468	73,751	82,414	89,081	88,770	82,434	98,267	345,848	358,552	325,521
Other Income (Expense)									49,865	3,620	(11,779)
Total before tax									395,713	362,172	313,742
Losses (Gains) on Asset Disposals and Impairments, Net:									(3,532)	(1,361)	2,824
Equity in Income of Investees	7,301	$ 10,618	$ 7,263	$ 8,316	7,905	$ 8,271	$ 4,913	$ 6,063	33,498	27,152	28,924
Total Capital Expenditures									311,052	255,027	182,124
Total Depreciation and Amortization									69,080	60,674	61,722
Total Assets	2,501,380				2,293,503				2,501,380	2,293,503	1,908,913
Total Investment in Unconsolidated Affiliates	85,284				71,806				85,284	71,806	70,116
Nuclear Power Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues									407,082	371,269	352,640
Nuclear Services Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues									123,538	136,493	131,339
Nuclear Operations Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues									1,622,598	1,646,257	1,428,587
Reportable Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues									2,153,218	2,154,019	1,912,566
Operating income									364,792	382,165	343,270
Total Capital Expenditures									300,622	243,811	175,098
Total Depreciation and Amortization									62,369	53,829	54,318
Total Assets	2,407,245				2,183,348				2,407,245	2,183,348	1,748,943
Reportable Segments \| Nuclear Power Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues									407,082	371,269	352,640
Operating income									52,548	51,989	53,815
Losses (Gains) on Asset Disposals and Impairments, Net:									(2,548)	(1,681)	103
Equity in Income of Investees									0	0	0
Total Capital Expenditures									153,571	106,596	38,053
Total Depreciation and Amortization									19,774	18,325	17,054
Total Assets	974,372				828,729				974,372	828,729	580,413
Total Investment in Unconsolidated Affiliates	0				0				0	0	0
Reportable Segments \| Nuclear Services Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues									123,538	136,493	131,339
Operating income									27,932	26,436	14,226
Losses (Gains) on Asset Disposals and Impairments, Net:									0	328	2,727
Equity in Income of Investees									33,498	27,152	28,924
Total Capital Expenditures									2,940	1,326	1,169
Total Depreciation and Amortization									1,005	1,685	3,246
Total Assets	186,249				166,240				186,249	166,240	177,952
Total Investment in Unconsolidated Affiliates	85,284				71,806				85,284	71,806	70,116
Reportable Segments \| Nuclear Operations Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues									1,622,598	1,646,257	1,428,587
Operating income									308,645	326,049	298,328
Losses (Gains) on Asset Disposals and Impairments, Net:									(8)	(8)	(6)
Equity in Income of Investees									0	0	0
Total Capital Expenditures									143,945	135,637	133,279
Total Depreciation and Amortization									40,514	33,174	33,231
Total Assets	1,243,766				1,184,741				1,243,766	1,184,741	986,827
Total Investment in Unconsolidated Affiliates	0				0				0	0	0
Eliminations
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues									(29,144)	(30,503)	(17,646)
Operating income									(18,944)	(23,613)	(17,749)
Losses (Gains) on Asset Disposals and Impairments, Net:									(976)	0	0
Total Capital Expenditures									166	252	2,597
Total Depreciation and Amortization									1,076	645	787
Total Assets	2,858				3,638				2,858	3,638	3,751
Eliminations \| Nuclear Power Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues									(778)	(553)	(208)
Eliminations \| Nuclear Services Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues									(22,964)	(26,159)	(13,056)
Eliminations \| Nuclear Operations Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues									(5,402)	(3,791)	(4,382)
Other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income									(24,333)	(22,309)	(23,099)
Losses (Gains) on Asset Disposals and Impairments, Net:									0	0	0
Equity in Income of Investees									0	0	0
Total Capital Expenditures									10,430	11,216	7,026
Total Depreciation and Amortization									6,711	6,845	7,404
Total Assets	94,135				110,155				94,135	110,155	159,970
Total Investment in Unconsolidated Affiliates	$ 0				$ 0				$ 0	$ 0	$ 0

Segment Reporting - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Losses (Gains) on Asset Disposals and Impairments, Net:									$ (3,532)	$ (1,361)	$ 2,824
Equity in income of investees	$ 7,301	$ 10,618	$ 7,263	$ 8,316	$ 7,905	$ 8,271	$ 4,913	$ 6,063	33,498	27,152	28,924
Total Capital Expenditures									311,052	255,027	182,124
Total Depreciation and Amortization									69,080	60,674	61,722
Total Assets	2,501,380				2,293,503				2,501,380	2,293,503	1,908,913
Total Investment in Unconsolidated Affiliates	85,284				71,806				85,284	71,806	70,116
Revenues	591,975	$ 498,727	$ 505,099	$ 528,273	556,910	$ 519,878	$ 504,520	$ 542,208	2,124,074	2,123,516	1,894,920
Nuclear Power Group
Segment Reporting Information [Line Items]
Revenues									407,082	371,269	352,640
Nuclear Services Group
Segment Reporting Information [Line Items]
Revenues									123,538	136,493	131,339
Nuclear Operations Group
Segment Reporting Information [Line Items]
Revenues									1,622,598	1,646,257	1,428,587
Reportable Segments
Segment Reporting Information [Line Items]
Total Capital Expenditures									300,622	243,811	175,098
Total Depreciation and Amortization									62,369	53,829	54,318
Total Assets	2,407,245				2,183,348				2,407,245	2,183,348	1,748,943
Revenues									2,153,218	2,154,019	1,912,566
Reportable Segments \| Nuclear Power Group
Segment Reporting Information [Line Items]
Losses (Gains) on Asset Disposals and Impairments, Net:									(2,548)	(1,681)	103
Equity in income of investees									0	0	0
Total Capital Expenditures									153,571	106,596	38,053
Total Depreciation and Amortization									19,774	18,325	17,054
Total Assets	974,372				828,729				974,372	828,729	580,413
Total Investment in Unconsolidated Affiliates	0				0				0	0	0
Revenues									407,082	371,269	352,640
Reportable Segments \| Nuclear Services Group
Segment Reporting Information [Line Items]
Losses (Gains) on Asset Disposals and Impairments, Net:									0	328	2,727
Equity in income of investees									33,498	27,152	28,924
Total Capital Expenditures									2,940	1,326	1,169
Total Depreciation and Amortization									1,005	1,685	3,246
Total Assets	186,249				166,240				186,249	166,240	177,952
Total Investment in Unconsolidated Affiliates	85,284				71,806				85,284	71,806	70,116
Revenues									123,538	136,493	131,339
Reportable Segments \| Nuclear Operations Group
Segment Reporting Information [Line Items]
Losses (Gains) on Asset Disposals and Impairments, Net:									(8)	(8)	(6)
Equity in income of investees									0	0	0
Total Capital Expenditures									143,945	135,637	133,279
Total Depreciation and Amortization									40,514	33,174	33,231
Total Assets	1,243,766				1,184,741				1,243,766	1,184,741	986,827
Total Investment in Unconsolidated Affiliates	0				0				0	0	0
Revenues									1,622,598	1,646,257	1,428,587
Other
Segment Reporting Information [Line Items]
Losses (Gains) on Asset Disposals and Impairments, Net:									0	0	0
Equity in income of investees									0	0	0
Total Capital Expenditures									10,430	11,216	7,026
Total Depreciation and Amortization									6,711	6,845	7,404
Total Assets	94,135				110,155				94,135	110,155	159,970
Total Investment in Unconsolidated Affiliates	0				0				0	0	0
Consolidation, Eliminations
Segment Reporting Information [Line Items]
Losses (Gains) on Asset Disposals and Impairments, Net:									(976)	0	0
Total Capital Expenditures									166	252	2,597
Total Depreciation and Amortization									1,076	645	787
Total Assets	$ 2,858				$ 3,638				2,858	3,638	3,751
Revenues									(29,144)	(30,503)	(17,646)
Consolidation, Eliminations \| Nuclear Power Group
Segment Reporting Information [Line Items]
Revenues									(778)	(553)	(208)
Consolidation, Eliminations \| Nuclear Services Group
Segment Reporting Information [Line Items]
Revenues									(22,964)	(26,159)	(13,056)
Consolidation, Eliminations \| Nuclear Operations Group
Segment Reporting Information [Line Items]
Revenues									$ (5,402)	$ (3,791)	$ (4,382)

Segment Reporting - Schedule of Revenue Information from Products and Service Lines (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from External Customer [Line Items]
Revenues	$ 591,975	$ 498,727	$ 505,099	$ 528,273	$ 556,910	$ 519,878	$ 504,520	$ 542,208	$ 2,124,074	$ 2,123,516	$ 1,894,920
Nuclear Power Group
Revenue from External Customer [Line Items]
Revenues									407,082	371,269	352,640
Nuclear Services Group
Revenue from External Customer [Line Items]
Revenues									123,538	136,493	131,339
Nuclear Operations Group
Revenue from External Customer [Line Items]
Revenues									1,622,598	1,646,257	1,428,587
Reportable Segments
Revenue from External Customer [Line Items]
Revenues									2,153,218	2,154,019	1,912,566
Reportable Segments \| Nuclear Power Group
Revenue from External Customer [Line Items]
Revenues									407,082	371,269	352,640
Reportable Segments \| Nuclear Power Group \| Nuclear Services and Engineering
Revenue from External Customer [Line Items]
Revenues									160,638	120,684	109,168
Reportable Segments \| Nuclear Power Group \| Nuclear Services and Engineering
Revenue from External Customer [Line Items]
Revenues									246,444	250,585	243,472
Reportable Segments \| Nuclear Services Group
Revenue from External Customer [Line Items]
Revenues									123,538	136,493	131,339
Reportable Segments \| Nuclear Services Group \| Nuclear Environmental Services
Revenue from External Customer [Line Items]
Revenues									77,514	94,320	102,726
Reportable Segments \| Nuclear Services Group \| Nuclear Services and Advanced Reactor Design and Engineering
Revenue from External Customer [Line Items]
Revenues									46,024	42,173	28,613
Reportable Segments \| Nuclear Operations Group
Revenue from External Customer [Line Items]
Revenues									1,622,598	1,646,257	1,428,587
Reportable Segments \| Nuclear Operations Group \| Government Programs
Revenue from External Customer [Line Items]
Revenues									1,527,704	1,540,256	1,368,555
Reportable Segments \| Nuclear Operations Group \| Commercial Operations
Revenue from External Customer [Line Items]
Revenues									94,894	106,001	60,032
Other
Revenue from External Customer [Line Items]
Revenues									$ (29,144)	$ (30,503)	$ (17,646)

Segment Reporting - Schedule of Revenues by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 591,975	$ 498,727	$ 505,099	$ 528,273	$ 556,910	$ 519,878	$ 504,520	$ 542,208	$ 2,124,074	$ 2,123,516	$ 1,894,920

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details

Segment Reporting - Schedule of Property, Plant and Equipment, Net by Geographical Area (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, Plant and Equipment, Net	$ 1,045,640	$ 816,471	$ 580,241
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, Plant and Equipment, Net	698,772	603,518	494,202
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, Plant and Equipment, Net	$ 346,868	$ 212,953	$ 86,039

Quarterly Financial Data - Selected Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 591,975	$ 498,727	$ 505,099	$ 528,273	$ 556,910	$ 519,878	$ 504,520	$ 542,208	$ 2,124,074	$ 2,123,516	$ 1,894,920
Operating income	102,215	87,468	73,751	82,414	89,081	88,770	82,434	98,267	345,848	358,552	325,521
Equity in income of investees	7,301	10,618	7,263	8,316	7,905	8,271	4,913	6,063	33,498	27,152	28,924
Net Income Attributable to BWX Technologies, Inc.	$ 116,861	$ 59,914	$ 59,347	$ 69,749	$ 65,742	$ 73,171	$ 64,258	$ 75,499	$ 305,871	$ 278,670	$ 244,115
Basic:
Net income attributable to BWX Technologies, Inc. (USD per share)	$ 1.27	$ 0.64	$ 0.62	$ 0.73	$ 0.69	$ 0.77	$ 0.67	$ 0.79	$ 3.24	$ 2.92	$ 2.56
Diluted:
Net income attributable to BWX Technologies, Inc. (USD per share)	$ 1.26	$ 0.63	$ 0.62	$ 0.73	$ 0.69	$ 0.76	$ 0.67	$ 0.79	$ 3.24	$ 2.91	$ 2.55

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Quarterly Financial Data - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Premium for early redemption of senior notes		$ 10,800		$ 10,752	$ 0	$ 0
Write-off of deferred financing costs		$ 4,200
Defined benefit plan, actuarial gain (loss)	$ 39,600		$ (6,400)

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic:
Net Income Attributable to BWX Technologies, Inc.									$ 305,871	$ 278,670	$ 244,115
Weighted-average common shares									94,278,894	95,457,193	95,377,414
Basic earnings per common share	$ 1.27	$ 0.64	$ 0.62	$ 0.73	$ 0.69	$ 0.77	$ 0.67	$ 0.79	$ 3.24	$ 2.92	$ 2.56
Diluted:
Weighted-average common shares									94,278,894	95,457,193	95,377,414
Effect of dilutive securities:
Stock options, restricted stock and performance shares (in shares)									239,528	269,304	433,124
Adjusted weighted average common shares (in shares)									94,518,422	95,726,497	95,810,538
Diluted earnings per common share:
Diluted earnings per common share (USD per share)	$ 1.26	$ 0.63	$ 0.62	$ 0.73	$ 0.69	$ 0.76	$ 0.67	$ 0.79	$ 3.24	$ 2.91	$ 2.55

Revenue Recognition - Revenue Remaining Performance Obligation (Details) $ in Millions	Dec. 31, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 5,176
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 1,854
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 1,244
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 2,078
Revenue, remaining performance obligation, expected timing of satisfaction, period
Nuclear Operations Group
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 4,511
Nuclear Operations Group \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 1,573
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Nuclear Operations Group \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 1,102
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Nuclear Operations Group \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 1,836
Revenue, remaining performance obligation, expected timing of satisfaction, period
Nuclear Power Group
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 21
Nuclear Power Group \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 21
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Nuclear Power Group \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 0
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Nuclear Power Group \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 0
Revenue, remaining performance obligation, expected timing of satisfaction, period
Nuclear Services Group
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 644
Nuclear Services Group \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 260
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Nuclear Services Group \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 142
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Nuclear Services Group \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Remaining Performance Obligations	$ 242
Revenue, remaining performance obligation, expected timing of satisfaction, period