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Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	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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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
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