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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, 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
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 624,177 $ 523,711 $ 554,208 $ 530,738 $ 591,975 $ 498,727 $ 505,099 $ 528,273 $ 2,232,834 $ 2,124,074 $ 2,123,516
Operating income 101,883 79,878 95,237 71,573 102,215 87,468 73,751 82,414 348,571 345,848 358,552
Equity in income of investees 11,092 14,783 11,319 8,779 7,301 10,618 7,263 8,316 45,973 33,498 27,152
Net Income Attributable to BWX Technologies, Inc. $ 42,965 $ 61,603 $ 74,613 $ 59,010 $ 116,861 $ 59,914 $ 59,347 $ 69,749 $ 238,191 $ 305,871 $ 278,670
Basic:                      
Net income attributable to BWX Technologies, Inc. (USD per share) $ 0.47 $ 0.67 $ 0.82 $ 0.64 $ 1.27 $ 0.64 $ 0.62 $ 0.73 $ 2.60 $ 3.24 $ 2.92
Diluted:                      
Net income attributable to BWX Technologies, Inc. (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