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Estimated Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2019 $ 25,433  
2020 36,001  
2021 33,709  
2022 32,306  
2023 30,442  
2024 27,932  
Thereafter 92,147  
Total intangible assets subject to amortization 277,970  
Indefinite-lived intangible assets (excluding goodwill) 357  
Other intangible assets, net $ 278,327 $ 211,272