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Goodwill and Other Intangible Assets - Estimated Future Aggregate Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2017 $ 10,142  
2018 39,381  
2019 37,229  
2020 35,824  
2021 33,478  
Thereafter 118,964  
Intangible Assets, Net $ 275,018 $ 187,023