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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
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Mar. 31, 2014 | Mar. 31, 2013
Business Combinations [Abstract] |  |
Revenues | $ 1,766,756 | $ 1,785,809
Gross profit | 271,736 | 277,641
Selling, general and administrative expenses | 174,359 | 128,020
Amortization of intangible assets | 8,326 | 9,236
Net income | 57,675 | 89,915
Net income attributable to common stock | $ 53,435 | $ 85,139
Earnings per share attributable to common stock - basic and diluted | $ 0.24 | $ 0.39

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