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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