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Pro Forma Results of Combined Company Operations (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition, Pro Forma Information [Abstract]    
Total Revenues $ 1,027,422us-gaap_BusinessAcquisitionsProFormaRevenue $ 1,017,681us-gaap_BusinessAcquisitionsProFormaRevenue
Net Income $ 78,002us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss $ 64,443us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Income per share    
Basic $ 0.66us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic $ 0.56us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Diluted $ 0.65us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted $ 0.54us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted