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Estimated Amortization Expense on Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Estimated amortization expense  
Remainder of 2015 $ 18,288us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2016 24,482us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 24,205us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 23,785us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 23,785us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter 13,521us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Net $ 128,066us-gaap_FiniteLivedIntangibleAssetsNet