Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Combinations [Abstract]
Revenues	$ 12,574,771	$ 11,894,866	$ 9,848,386
Gross profit	1,699,924	1,635,777	1,356,515
Selling, general and administrative expenses	989,555	913,392	842,996
Amortization of intangible assets	78,320	79,454	49,918
Net income	437,399	332,973	333,386
Net income attributable to common stock	$ 432,628	$ 330,312	$ 330,139
Earnings per share:
Basic (in dollars per share)	$ 2.97	$ 2.16	$ 2.08
Diluted (in dollars per share)	$ 2.93	$ 2.14	$ 2.07