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Amortizable Intangible Assets - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense for amortizable intangible assets $ 82,941us-gaap_AdjustmentForAmortization $ 67,932us-gaap_AdjustmentForAmortization $ 63,573us-gaap_AdjustmentForAmortization
Amortization expense estimated, year one (2015) 86,029us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Amortization expense estimated, year two (2016) 81,547us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Amortization expense estimated, year three (2017) 78,640us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Amortization expense estimated, year four (2018) 73,262us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Amortization expense estimated, year five (2019) $ 68,722us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive