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Acquisitions - Unaudited Supplemental Proforma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Business Combinations [Abstract] |  |  |  |
Revenues | $ 1,873,169 | $ 2,034,146 | $ 3,749,834 | $ 3,968,023
Gross profit | 227,739 | 284,616 | 469,840 | 560,434
Selling, general and administrative expenses | 150,128 | 146,302 | 298,208 | 326,760
Amortization of intangible assets | 8,743 | 11,066 | 17,283 | 22,298
Net income from continuing operations | 35,481 | 82,014 | 88,720 | 136,523
Net income from continuing operations attributable to common stock | $ 32,025 | $ 77,652 | $ 80,563 | $ 127,921
Earnings per share from continuing operations attributable to common stock - basic and diluted | $ 0.15 | $ 0.35 | $ 0.38 | $ 0.57

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- Definition The pro forma amortization of intangible assets for a period as if the business combination or combinations had been completed at the beginning of the period. + References No definition available. + Details
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