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Business Acquisitions - Schedule of Pro Forma Information Combines Consolidated Results of Company and Business Acquisitions (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Business Combinations [Abstract]    
Net revenue $ 1,870,039 $ 1,799,726
Net income $ 233,175 $ 217,019
Net income per share, Basic $ 2.36 $ 2.19
Net income per share, Diluted $ 2.33 $ 2.15
Weighted average shares, Basic 98,791 99,022
Weighted average shares, Diluted 100,168 100,962