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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net income $ 279,196 $ 244,677 $ 227,305
Other Comprehensive Income (Loss):      
Currency translation adjustments 15,685 5,263 (9,642)
Derivative financial instruments:      
Unrealized (losses) gains arising during the period, net of tax benefit (provision) of $24, $442 and $(167), respectively (73) (1,586)  
Unrealized (losses) gains arising during the period, net of tax benefit (provision) of $24, $442 and $(167), respectively     450
Reclassification adjustment for (gains) losses included in net income, net of tax provision (benefit) of $173, $(310) and $47, respectively (487) 888  
Reclassification adjustment for (gains) losses included in net income, net of tax provision (benefit) of $173, $(310) and $47, respectively     (118)
Benefit obligations:      
Unrecognized losses arising during the period, net of tax benefit of $513, $1,274 and $2,290, respectively (1,820) (4,249) (8,444)
Recognition of benefit plan costs, net of tax benefit of $(645), $(562) and $(410), respectively 2,532 2,030 1,500
Investments:      
Unrealized (losses) gains arising during the period, net of tax provision of $(56), $(3) and $(6), respectively (191) 418 (102)
Reclassification adjustment for gains included in net income, net of tax provision of $0, $0 and $1, respectively 0 0 (2)
Other Comprehensive Income (Loss) 15,646 2,764 (16,358)
Total Comprehensive Income 294,842 247,441 210,947
Comprehensive Income Attributable to Noncontrolling Interest (526) (562) (347)
Comprehensive Income Attributable to BWX Technologies, Inc. $ 294,316 $ 246,879 $ 210,600