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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
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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

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