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Goodwill and Other Assets - Amortization Expenses for Existing Other Intangible Assets for the Next Five Years (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortization expense for existing other intangible assets, 2015 $ 36,874us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Amortization expense for existing other intangible assets, 2016 30,985us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Amortization expense for existing other intangible assets, 2017 24,919us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Amortization expense for existing other intangible assets, 2018 20,190us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Amortization expense for existing other intangible assets, 2019 $ 16,059us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive