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Goodwill and Other Intangible Assets - Estimated Future Aggregate Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 31,496  
2019 38,878  
2020 37,444  
2021 35,106  
2022 31,576  
Thereafter 96,326  
Intangible Assets, Net $ 270,826 $ 263,179