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Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 63,444  
2020 42,229  
2021 35,771  
2022 35,189  
2023 34,500  
Thereafter 84,554  
Intangible assets, net $ 295,687 $ 182,430