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Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Detail) - Acquisitions - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |  |
Revenues | $ 2,631,137 | $ 2,174,123 | $ 7,234,193 | $ 5,970,857
Gross profit | 355,830 | 331,409 | 978,446 | 796,989
Selling, general and administrative expenses | 205,025 | 184,014 | 614,819 | 541,328
Amortization of intangible assets | 10,022 | 11,576 | 29,926 | 34,696
Net income from continuing operations | 89,839 | 75,866 | 205,344 | 118,853
Net income from continuing operations attributable to common stock | $ 89,303 | $ 75,456 | $ 204,112 | $ 117,913
Earnings per share from continuing operations: basic (in usd per share) | $ 0.56 | $ 0.48 | $ 1.29 | $ 0.73
Earnings per share from continuing operations: diluted (in usd per share) | $ 0.56 | $ 0.48 | $ 1.28 | $ 0.73

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