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Goodwill and Other Intangible Assets, Net - Estimated Future Amortization Expense of Definite Life Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 $ 22,200  
2020 23,600  
2021 22,400  
2022 19,400  
2023 18,800  
2024 and thereafter 117,100  
Net definite life intangible assets $ 223,468 $ 209,846