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Intangible Assets - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Intangible Assets [Line Items]    
Amortization Expense $ 24,800,000us-gaap_AmortizationOfIntangibleAssets $ 26,258,000us-gaap_AmortizationOfIntangibleAssets
Expected amortization of intangibles, 2015 96,100,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
Expected amortization of intangibles, 2016 85,600,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
Expected amortization of intangibles, 2017 46,500,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
Expected amortization of intangibles, 2018 46,500,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
Expected amortization of intangibles, 2019 $ 46,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
Intangible assets expected to amortize over a weighted-average period 6 years 8 months 12 days