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Estimated Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 39,162  
2019 26,362  
2020 25,449  
2021 21,225  
2022 16,197  
Thereafter 28,873  
Total intangible assets subject to amortization, net 157,268  
Indefinite-lived trade name 357  
Other intangible assets, net $ 157,625 $ 172,619