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Quarterly Financial Data (Unaudited) - Selected Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 725,515 $ 589,989 $ 612,445 $ 568,360 $ 624,177 $ 523,711 $ 554,208 $ 530,738 $ 2,496,309 $ 2,232,834 $ 2,124,074
Operating income 123,193 85,358 86,666 87,842 101,883 79,878 95,237 71,573 383,059 348,571 345,848
Equity in income of investees 11,945 12,649 12,568 13,645 11,092 14,783 11,319 8,779 50,807 45,973 33,498
Net Income Attributable to BWX Technologies, Inc. $ 65,887 $ 60,273 $ 58,597 $ 61,092 $ 42,965 $ 61,603 $ 74,613 $ 59,010 $ 245,849 $ 238,191 $ 305,871
Basic:                      
Net Income attributable to BWX Technologies, Inc. (USD per share) $ 0.72 $ 0.66 $ 0.64 $ 0.67 $ 0.47 $ 0.67 $ 0.82 $ 0.64 $ 2.68 $ 2.60 $ 3.24
Diluted:                      
Net Income attributable to BWX Technologies, Inc. (USD per share) $ 0.72 $ 0.66 $ 0.64 $ 0.67 $ 0.47 $ 0.67 $ 0.82 $ 0.64 $ 2.68 $ 2.60 $ 3.24