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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, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 591,975 $ 498,727 $ 505,099 $ 528,273 $ 556,910 $ 519,878 $ 504,520 $ 542,208 $ 2,124,074 $ 2,123,516 $ 1,894,920
Operating income 102,215 87,468 73,751 82,414 89,081 88,770 82,434 98,267 345,848 358,552 325,521
Equity in income of investees 7,301 10,618 7,263 8,316 7,905 8,271 4,913 6,063 33,498 27,152 28,924
Net Income Attributable to BWX Technologies, Inc. $ 116,861 $ 59,914 $ 59,347 $ 69,749 $ 65,742 $ 73,171 $ 64,258 $ 75,499 $ 305,871 $ 278,670 $ 244,115
Basic:                      
Net income attributable to BWX Technologies, Inc. (USD per share) $ 1.27 $ 0.64 $ 0.62 $ 0.73 $ 0.69 $ 0.77 $ 0.67 $ 0.79 $ 3.24 $ 2.92 $ 2.56
Diluted:                      
Net income attributable to BWX Technologies, Inc. (USD per share) $ 1.26 $ 0.63 $ 0.62 $ 0.73 $ 0.69 $ 0.76 $ 0.67 $ 0.79 $ 3.24 $ 2.91 $ 2.55