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Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Intangible Assets [Line Items]    
Remainder of 2015 $ 2,972  
2016 11,520  
2017 9,822  
2018 8,822  
2019 and thereafter 3,276  
Net Book Value $ 36,412 $ 45,664