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Business Acquisitions - Schedule of Pro Forma Information Combines Consolidated Results of Company and Business Acquisitions (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Business Combinations [Abstract]    
Net revenue $ 2,946,467 $ 2,945,493
Net income $ 343,575 $ 345,517
Net income per common share, Basic $ 3.69 $ 3.50
Net income per common share, Diluted $ 3.66 $ 3.46
Weighted average common shares, Basic 93,077 98,588
Weighted average common shares, Diluted 93,960 99,887