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Acquisitions and Divestitures - Supplemental Pro Forma Information (Detail) - Etratech Inc. $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares
Business Acquisition [Line Items]
Product revenues | $	$ 1,032,273
Net income | $	$ 35,911
Basic earnings per share | $ / shares	$ 0.98
Diluted earnings per share | $ / shares	$ 0.98

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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