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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 $ 106,859  
2019 105,191  
2020 100,509  
2021 91,428  
2022 79,315  
Thereafter 264,570  
Intangible Assets, Net $ 747,872 $ 662,403