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Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Goodwill and Other Intangible Assets [Line Items]    
Remainder of 2017 $ 5,953  
2018 11,343  
2019 5,551  
2020 2,655  
2021 2,631  
2022 and thereafter 9,711  
Net Book Value $ 37,844 $ 44,191