Business Combinations - Pro Forma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
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

Business Acquisition Pro Forma Earnings Per Share Basic And Diluted.

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- Definition

Business Combination Increase Decrease To Reflect Liabilities Acquired At Fair Value [Abstract]

+ References

No definition available.

+ Details

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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

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- Definition

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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