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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Business Combinations [Abstract]      
Revenues $ 6,947,284 $ 6,477,648 $ 4,378,213
Gross profit 1,144,024 1,060,370 613,047
Selling, general and administrative expenses 531,342 478,184 359,514
Amortization of intangible assets 31,361 52,339 39,252
Net income from continuing operations 454,311 344,925 143,423
Net income from continuing operations attributable to common stock $ 434,923 $ 328,898 $ 131,522
Earnings per share from continuing operations attributable to common stock - basic and diluted $ 2.00 $ 1.52 $ 0.61