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Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Intangible Assets [Line Items]    
Remainder of 2015 $ 5,954  
2016 11,524  
2017 9,826  
2018 8,826  
2019 3,034  
2020 and thereafter 255  
Net Book Value $ 39,419 $ 45,664