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Estimated Aggregate Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
For the three months ended December 31, 2015 $ 1,319  
For the twelve months ended December 31, 2016 5,560  
For the twelve months ended December 31, 2017 5,027  
For the twelve months ended December 31, 2018 4,901  
For the twelve months ended December 31, 2019 4,002  
Thereafter 21,540  
Total $ 42,349 $ 47,690