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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Business Combination and Asset Acquisition [Abstract] |  |  |  |
Revenues | $ 3,357,877 | $ 3,069,921 | $ 9,090,656 | $ 8,519,226
Gross profit | 535,935 | 520,866 | 1,367,256 | 1,254,826
Selling, general and administrative expenses | (275,363) | (256,608) | (794,249) | (740,564)
Amortization of intangible assets | (22,836) | (22,843) | (68,167) | (69,742)
Net income | 175,865 | 166,326 | 387,713 | 287,171
Net income attributable to common stock | $ 174,832 | $ 165,539 | $ 383,184 | $ 282,718
Earnings per share attributable to common stock: |  |  |  |
Basic (in dollars per share) | $ 1.25 | $ 1.17 | $ 2.73 | $ 1.98
Diluted (in dollars per share) | $ 1.21 | $ 1.14 | $ 2.65 | $ 1.94

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