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Estimated Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]    
2017 $ 83,501  
2018 80,953  
2019 80,531  
2020 78,766  
2021 72,227  
Thereafter 266,425  
Intangible Assets, Net $ 662,403 $ 295,646