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Business Combinations - Summary of Unaudited Supplemental Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Business Combinations [Abstract] |  |  |  |
Pro forma revenue | $ 170,498 | $ 159,375 | $ 478,184 | $ 463,916
Pro forma net income | $ 9,495 | $ 6,691 | $ 24,761 | $ 15,071
Pro forma earnings per share - basic | $ 0.20 | $ 0.13 | $ 0.51 | $ 0.29
Pro forma earnings per share - diluted | $ 0.20 | $ 0.13 | $ 0.50 | $ 0.29

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- Definition 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. + 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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