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Acquisitions - Unaudited Supplemental ProForma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Business Combinations [Abstract] |  |  |  |
Revenues | $ 2,042,186 | $ 1,981,430 | $ 5,574,327 | $ 5,812,597
Gross profit | 302,582 | 241,666 | 709,820 | 725,969
Selling, general and administrative expenses | 164,325 | 149,662 | 482,226 | 455,755
Amortization of intangible assets | 8,094 | 9,583 | 24,312 | 30,173
Net income from continuing operations | 73,547 | 46,525 | 111,164 | 137,181
Net income from continuing operations attributable to common stock | $ 73,137 | $ 43,957 | $ 110,224 | $ 126,456
Earnings per share from continuing operations attributable to common stock - basic and diluted | $ 0.47 | $ 0.23 | $ 0.70 | $ 0.61

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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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