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Goodwill and Other Intangible Assets - Estimated Future Aggregate Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 12,307  
2019 45,333  
2020 43,172  
2021 40,836  
2022 37,307  
Thereafter 102,456  
Intangible Assets, Net $ 281,411 $ 263,179