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Business Combinations - Pro Forma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Combination Increase Decrease To Reflect Liabilities Acquired At Fair Value [Abstract] |  |  |
Net revenue | $ 1,169,061 | $ 1,058,707 | $ 786,144
Net income | $ 43,179 | $ 43,891 | $ 29,463
Basic and diluted net income per share | $ 1,360 | $ 1,390 | $ 940

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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