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Acquisitions - Unaudited Supplemental Proforma Results of Operations (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Business Combinations [Abstract]        
Revenues $ 1,664,282 $ 1,605,188 $ 4,926,496 $ 4,480,965
Gross profit 275,573 262,809 781,801 685,531
Selling, general and administrative expenses 126,012 118,924 367,893 332,163
Amortization of intangible assets 7,070 11,438 19,399 35,217
Net income from continuing operations 99,240 91,522 260,789 209,297
Net income from continuing operations attributable to common stock $ 93,738 $ 87,064 $ 246,022 $ 196,293
Earnings per share from continuing operations attributable to common stock - basic and diluted $ 0.44 $ 0.41 $ 1.15 $ 0.91