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Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Combinations [Abstract] |  |  |  |
Revenues | $ 3,446,437 | $ 3,149,694 | $ 9,391,582 | $ 8,560,960
Gross profit | 495,994 | 463,109 | 1,246,605 | 1,175,470
Selling, general and administrative expenses | 250,187 | 235,637 | 725,801 | 682,342
Amortization of intangible assets | 18,918 | 18,329 | 55,503 | 59,463
Net income | 145,602 | 135,311 | 316,941 | 267,108
Net income attributable to common stock | $ 144,648 | $ 134,963 | $ 314,325 | $ 265,422
Earnings per share: |  |  |  |
Basic (in dollars per share) | $ 0.99 | $ 0.88 | $ 2.16 | $ 1.72
Diluted (in dollars per share) | $ 0.98 | $ 0.88 | $ 2.14 | $ 1.71

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