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Summary of Selected Financial Information of the Company on a Pro Forma Basis (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition Pro Forma Information [Abstract]    
Revenues $ 2,738,579 $ 1,567,141
Net income (loss) $ 29,584 $ (505,413)
Net income (loss) per share    
Basic $ 0.13 $ (2.30)
Diluted $ 0.13 $ (2.30)