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Acquisitions - Summary of Unaudited Pro Forma Financial Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Combinations [Abstract]      
Net revenues $ 1,291,771us-gaap_BusinessAcquisitionsProFormaRevenue $ 1,255,376us-gaap_BusinessAcquisitionsProFormaRevenue $ 1,225,958us-gaap_BusinessAcquisitionsProFormaRevenue
Net income applicable to common stock $ 256,785us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss $ 40,725us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss $ 12,098us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Net income per common share - basic $ 2.70us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic $ 0.43us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic $ 0.13us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Net income per common share - diluted $ 2.69us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted $ 0.43us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted $ 0.13us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted