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Business Combinations - Summary of Unaudited Supplemental Pro Forma Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Business Combinations [Abstract]    
Pro forma revenue $ 122,066 $ 170,692
Pro forma net income $ (22,720) $ 17,201
Pro forma earnings per share - basic $ (0.47) $ 0.36
Pro forma earnings per share - diluted $ (0.47) $ 0.35