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Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Combinations [Abstract]
Revenues	$ 11,400,807	$ 12,844,508	$ 11,894,866
Gross profit	1,708,844	1,761,317	1,635,777
Selling, general and administrative expenses	(998,283)	(1,027,254)	(913,392)
Amortization of intangible assets	(86,721)	(95,185)	(79,454)
Net income	459,890	434,593	332,973
Net income attributable to common stock	$ 453,527	$ 429,822	$ 330,312
Earnings per share:
Basic (in dollars per share)	$ 3.19	$ 2.92	$ 2.16
Diluted (in dollars per share)	$ 3.11	$ 2.89	$ 2.14

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
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