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Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Intangible Assets [Line Items]    
Remainder of 2016 $ 8,562  
2017 9,812  
2018 8,812  
2019 3,020  
2020 and thereafter 225  
Net Book Value $ 30,431 $ 33,418