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Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Goodwill and Other Intangible Assets [Line Items]    
Remainder of 2017 $ 9,129  
2018 11,337  
2019 5,545  
2020 2,649  
2021 2,626  
2022 and thereafter 9,712  
Net Book Value $ 40,998 $ 44,191