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Goodwill and Other Intangible Assets - Estimated Future Aggregate Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 39,188  
2019 37,038  
2020 35,639  
2021 33,295  
2022 29,764  
Thereafter 88,255  
Intangible Assets, Net $ 263,179 $ 187,023