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Estimated Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]    
2017 $ 14,375  
2018 13,417  
2019 12,107  
2020 11,727  
2021 11,021  
Thereafter 420,068  
Net Balance $ 482,715 $ 481,795