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Goodwill and Other Intangible Assets - Estimated Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]    
2015 $ 33,030us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 25,273us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 25,213us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 25,201us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 17,919us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
2020 and thereafter 11,526us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Amortized balance of intangible assets, Net $ 145,082us-gaap_FiniteLivedIntangibleAssetsNet $ 10,401us-gaap_FiniteLivedIntangibleAssetsNet