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Acquisitions - Schedule of Unaudited Pro Forma Financial Information (Detail) - Newport [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Business Acquisition [Line Items] |  |  |  |
Total net revenues | $ 380,660 | $ 355,955 | $ 1,070,471 | $ 1,090,641
Net income | $ 35,915 | $ 23,725 | $ 65,313 | $ 48,239
Net income per share: |  |  |  |
Basic | $ 0.67 | $ 0.45 | $ 1.22 | $ 0.90
Diluted | $ 0.66 | $ 0.44 | $ 1.21 | $ 0.90

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