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Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Combinations [Abstract]
Revenues	$ 11,238,475	$ 9,848,386	$ 8,183,104
Gross profit	1,506,125	1,356,515	1,129,661
Selling, general and administrative expenses	865,452	842,996	734,900
Amortization of intangible assets	49,262	49,918	46,579
Net income from continuing operations	304,565	333,386	207,956
Net income from continuing operations attributable to common stock	$ 301,904	$ 330,139	$ 206,241
Earnings per share from continuing operations:
Basic (in dollars per share)	$ 1.97	$ 2.08	$ 1.29
Diluted (in dollars per share)	$ 1.95	$ 2.07	$ 1.29

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Per basic share amount of pro forma income from continuing operations, after tax, as if the business combination had been completed at the beginning of a period.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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