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Acquisitions - Unaudited Supplemental Proforma Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Business Acquisition [Line Items] |  |  |
Revenues | $ 5,933,830 | $ 4,378,213 | $ 3,910,662
Gross profit | 939,663 | 613,047 | 656,413
Selling, general and administrative expenses | 436,022 | 359,514 | 335,576
Amortization of intangible assets | 37,780 | 39,252 | 54,843
Net income from continuing operations | 306,124 | 143,423 | 159,259
Net income attributable to common stock | 307,032 | 145,526 | 167,361
Net income from continuing operations attributable to common stock | $ 290,097 | $ 131,522 | $ 156,878
Earnings per share from continuing operations attributable to common stock: |  |  |
Basic | $ 1.36 | $ 0.61 | $ 0.73
Diluted | $ 1.36 | $ 0.61 | $ 0.72

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