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Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Combinations [Abstract]
Revenues	$ 3,446,437	$ 3,149,694	$ 9,391,582	$ 8,560,960
Gross profit	495,994	463,109	1,246,605	1,175,470
Selling, general and administrative expenses	250,187	235,637	725,801	682,342
Amortization of intangible assets	18,918	18,329	55,503	59,463
Net income	145,602	135,311	316,941	267,108
Net income attributable to common stock	$ 144,648	$ 134,963	$ 314,325	$ 265,422
Earnings per share:
Basic (in dollars per share)	$ 0.99	$ 0.88	$ 2.16	$ 1.72
Diluted (in dollars per share)	$ 0.98	$ 0.88	$ 2.14	$ 1.71

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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
-Paragraph 2
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