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Estimated Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 $ 13,070  
2019 12,114  
2020 12,078  
2021 11,387  
2022 9,805  
Thereafter 414,018  
Net Balance $ 472,472 $ 482,715