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Acquisitions - Unaudited Pro Forma Financial Information (Details) - Sotera Health LLC's Nordion Medical Isotope Business - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Revenues	$ 1,825,029	$ 1,726,135
Net Income Attributable to BWX Technologies, Inc.	$ 228,545	$ 143,475
Basic Earnings per Common Share (USD per share)	$ 2.31	$ 1.44
Diluted Earnings per Common Share (USD per share)	$ 2.29	$ 1.43

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