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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, 2019 | Mar. 31, 2018
Business Combinations [Abstract] |  |
Revenues | $ 2,811,139 | $ 2,454,974
Gross profit | 364,779 | 313,628
Selling, general and administrative expenses | 232,361 | 220,234
Amortization of intangible assets | 12,868 | 12,982
Net income | 121,021 | 41,715
Net income attributable to common stock | $ 120,474 | $ 40,718
Earnings per share: |  |
Basic (in dollars per share) | $ 0.83 | $ 0.26
Diluted (in dollars per share) | $ 0.82 | $ 0.26

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