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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, 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
Basic:
Net Income Attributable to BWX Technologies, Inc.									$ 305,871	$ 278,670	$ 244,115
Weighted-average common shares									94,278,894	95,457,193	95,377,414
Basic earnings per common share	$ 1.27	$ 0.64	$ 0.62	$ 0.73	$ 0.69	$ 0.77	$ 0.67	$ 0.79	$ 3.24	$ 2.92	$ 2.56
Diluted:
Weighted-average common shares									94,278,894	95,457,193	95,377,414
Effect of dilutive securities:
Stock options, restricted stock and performance shares (in shares)									239,528	269,304	433,124
Adjusted weighted average common shares (in shares)									94,518,422	95,726,497	95,810,538
Diluted earnings per common share:
Diluted earnings per common share (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

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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