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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

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