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Estimated Aggregate Future Amortization Expense for Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
For the nine months ended December 31, 2015 $ 4,341us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
For the twelve months ended December 31, 2016 5,585us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
For the twelve months ended December 31, 2017 5,052us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
For the twelve months ended December 31, 2018 4,925us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
For the twelve months ended December 31, 2019 4,016us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 22,093us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total $ 46,012us-gaap_FiniteLivedIntangibleAssetsNet $ 47,690us-gaap_FiniteLivedIntangibleAssetsNet