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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic
Net income attributable to BWX Technologies, Inc.	$ 60,663	$ 61,263	$ 127,104	$ 116,982
Weighted-average common shares (in shares)	99,681,580	99,166,205	99,603,884	99,305,558
Basic earnings per common share (in usd per share)	$ 0.61	$ 0.62	$ 1.28	$ 1.18
Diluted
Net income attributable to BWX Technologies, Inc.	$ 60,663	$ 61,263	$ 127,104	$ 116,982
Weighted-average common shares (in shares)	99,681,580	99,166,205	99,603,884	99,305,558
Effect of dilutive securities
Stock options, restricted stock units and performance shares (in shares)	890,157	984,721	938,130	1,115,390
Adjusted weighted-average common shares (in shares)	100,571,737	100,150,926	100,542,014	100,420,948
Diluted earnings per common share (in usd per share)	$ 0.60	$ 0.61	$ 1.26	$ 1.16

X

- 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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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