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Goodwill and Other Intangible Assets, Net - Estimated Future Amortization Expense of Definite Life Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 $ 7,100  
2019 28,400  
2020 23,700  
2021 19,500  
2022 14,700  
2023 and thereafter 108,700  
Net definite life intangible assets $ 202,139 $ 219,044