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Remaining Amortization Expense Associated with Finite-Lived Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 $ 17,580  
2019 13,630  
2020 11,686  
2021 4,896  
2022 4,875  
Thereafter 22,932  
Net Carrying Amount $ 75,599 $ 2,732