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Acquisitions and Divestitures - Supplemental Pro Forma Information (Detail) - Etratech Inc. $ / shares in Units, $ in Thousands | 12 Months Ended
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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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