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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