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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic:                      
Net Income Attributable to BWX Technologies, Inc.                 $ 278,670 $ 244,115 $ 226,958
Weighted-average common shares                 95,457,193 95,377,414 99,062,087
Basic earnings per common share $ 0.69 $ 0.77 $ 0.67 $ 0.79 $ 0.64 $ 0.78 $ 0.62 $ 0.51 $ 2.92 $ 2.56 $ 2.29
Diluted:                      
Weighted-average common shares                 95,457,193 95,377,414 99,062,087
Effect of dilutive securities:                      
Stock options, restricted stock and performance shares (in shares)                 269,304 433,124 956,966
Adjusted weighted average common shares (in shares)                 95,726,497 95,810,538 100,019,053
Diluted earnings per common share:                      
Diluted earnings per common share (USD per share) $ 0.69 $ 0.76 $ 0.67 $ 0.79 $ 0.64 $ 0.78 $ 0.62 $ 0.51 $ 2.91 $ 2.55 $ 2.27