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Estimated Amortization Expense for Existing Intangible Assets for Each of Five Succeeding Years (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]  
Remaining 2015 $ 2,921us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2016 11,619us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 11,609us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 11,140us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 $ 10,715us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive