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Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Goodwill and Other Intangible Assets [Line Items]    
Remainder of 2017 $ 2,846  
2018 11,347  
2019 5,555  
2020 2,659  
2021 2,637  
2022 and thereafter 9,711  
Net Book Value $ 34,755 $ 44,191