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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Combinations [Abstract] |  |  |  |
Revenues | $ 3,034,191 | $ 3,510,941 | $ 8,412,036 | $ 9,580,086
Gross profit | 509,532 | 507,299 | 1,220,824 | 1,278,843
Selling, general and administrative expenses | (251,664) | (260,223) | (725,732) | (754,625)
Amortization of intangible assets | (20,526) | (22,765) | (62,793) | (67,044)
Net income | 163,687 | 142,272 | 279,654 | 307,513
Net income attributable to common stock | $ 162,900 | $ 141,318 | $ 275,201 | $ 304,897
Earnings per share: |  |  |  |
Basic (in dollars per share) | $ 1.16 | $ 0.96 | $ 1.93 | $ 2.08
Diluted (in dollars per share) | $ 1.13 | $ 0.95 | $ 1.89 | $ 2.06

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