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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, 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
Basic:                      
Net Income Attributable to BWX Technologies, Inc.                 $ 245,849 $ 238,191 $ 305,871
Weighted-average common shares (in shares)                 91,619,156 91,447,088 94,278,894
Earnings per share (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:                      
Weighted-average common shares (in shares)                 91,619,156 91,447,088 94,278,894
Effect of dilutive securities:                      
Stock options, restricted stock units and performance shares (in shares)                 255,381 255,023 239,528
Adjusted weighted average common shares (in shares)                 91,874,537 91,702,111 94,518,422
Diluted earnings per common share (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
Antidilutive shares related to stock options excluded from the diluted share (in shares)                 6,089 10,419 0