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Quarterly Financial Data - Selected Quarterly Financial Information (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
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 556,910 $ 519,878 $ 504,520 $ 542,208 $ 501,235 $ 506,000 $ 471,231 $ 416,454 $ 2,123,516 $ 1,894,920 $ 1,799,889
Operating income 89,081 88,770 82,434 98,267 82,880 98,462 80,535 63,644 358,552 325,521 304,977
Equity in income of investees 7,905 8,271 4,913 6,063 6,506 7,874 6,862 7,682 27,152 28,924 30,343
Net Income Attributable to BWX Technologies, Inc. $ 65,742 $ 73,171 $ 64,258 $ 75,499 $ 61,449 $ 74,810 $ 58,878 $ 48,978 $ 278,670 $ 244,115 $ 226,958
Basic:                      
Net income attributable to BWX Technologies, Inc. (USD per share) $ 0.69 $ 0.77 $ 0.67 $ 0.79 $ 0.64 $ 0.78 $ 0.62 $ 0.51 $ 2.92 $ 2.56 $ 2.29
Diluted:                      
Net income attributable to BWX Technologies, Inc. (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