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Goodwill and Intangible Assets - Summary of Estimated Amortization Expense for Future Years (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
For the year ended December 31, 2015 $ 31,180us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
For the year ended December 31, 2016 30,049us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
For the year ended December 31, 2017 27,244us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
For the year ended December 31, 2018 15,611us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
For the year ended December 31, 2019 $ 6,211us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive