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Estimated Amortization Expense of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]    
2015 $ 14,488us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 14,183us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 14,044us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 13,153us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 11,847us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 474,533us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Net Balance $ 542,248us-gaap_FiniteLivedIntangibleAssetsNet $ 24,556us-gaap_FiniteLivedIntangibleAssetsNet