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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, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Basic:                      
Net Income Attributable to BWX Technologies, Inc.                 $ 238,191 $ 305,871 $ 278,670
Weighted-average common shares                 91,447,088 94,278,894 95,457,193
Basic earnings per common share $ 0.47 $ 0.67 $ 0.82 $ 0.64 $ 1.27 $ 0.64 $ 0.62 $ 0.73 $ 2.60 $ 3.24 $ 2.92
Diluted:                      
Weighted-average common shares                 91,447,088 94,278,894 95,457,193
Effect of dilutive securities:                      
Stock options, restricted stock and performance shares (in shares)                 255,023 239,528 269,304
Adjusted weighted average common shares (in shares)                 91,702,111 94,518,422 95,726,497
Diluted earnings per common share:                      
Diluted earnings per common share (USD per share) $ 0.47 $ 0.67 $ 0.82 $ 0.64 $ 1.26 $ 0.63 $ 0.62 $ 0.73 $ 2.60 $ 3.24 $ 2.91
Antidilutive shares related to stock options excluded from the diluted share (in shares)                 10,419 0 0