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Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
2018 $ 43,670  
2019 41,540  
2020 26,767  
2021 20,055  
2022 19,907  
Thereafter 30,491  
Intangible assets, net $ 182,430 $ 217,548