Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Business Combination and Asset Acquisition [Abstract]
Revenues	$ 3,000,377	$ 2,580,496	$ 5,705,185	$ 5,421,711
Gross profit	449,073	374,134	823,767	726,406
Selling, general and administrative expenses	(271,073)	(238,802)	(515,784)	(480,854)
Amortization of intangible assets	(21,952)	(22,398)	(43,988)	(45,083)
Net income	118,703	76,355	209,758	119,136
Net income attributable to common stock	$ 116,765	$ 75,506	$ 206,262	$ 115,470
Earnings per share attributable to common stock:
Basic (in dollars per share)	$ 0.83	$ 0.54	$ 1.47	$ 0.81
Diluted (in dollars per share)	$ 0.81	$ 0.52	$ 1.43	$ 0.79