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Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Business Combinations [Abstract] |  |
Revenues | $ 2,704,247 | $ 2,840,654
Gross profit | 373,332 | 350,910
Selling, general and administrative expenses | (243,748) | (241,089)
Amortization of intangible assets | (21,375) | (22,025)
Net income | 91,328 | 43,091
Net income attributable to common stock | $ 89,770 | $ 40,274
Earnings per share attributable to common stock: |  |
Basic (in dollars per share) | $ 0.64 | $ 0.28
Diluted (in dollars per share) | $ 0.62 | $ 0.27

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