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Goodwill and Other 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 $ 96,139us-gaap_AmortizationOfIntangibleAssets $ 106,533us-gaap_AmortizationOfIntangibleAssets $ 102,941us-gaap_AmortizationOfIntangibleAssets