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Business Acquisition Pro-forma Unaudited Financial Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition Pro Forma Information [Abstract]    
Revenue $ 3,302,492us-gaap_BusinessAcquisitionsProFormaRevenue $ 2,854,867us-gaap_BusinessAcquisitionsProFormaRevenue
Net income $ 169,831us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss $ 196,600us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Basic net income per common share $ 1.17us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic $ 1.35us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Diluted net income per common share $ 1.16us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted $ 1.34us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted