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Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Detail) - Acquisitions - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Revenues	$ 9,712,820	$ 8,183,104	$ 7,770,744
Gross profit	1,301,322	1,129,661	956,925
Selling, general and administrative expenses	821,084	734,900	612,979
Amortization of intangible assets	40,356	46,579	39,947
Net income from continuing operations	320,768	207,956	136,608
Net income from continuing operations attributable to common stock	$ 317,521	$ 206,241	$ 125,691
Earnings per share from continuing operations - basic (in usd per share)	$ 2.01	$ 1.29	$ 0.64
Earnings per share from continuing operations - diluted (in usd per share)	$ 2.00	$ 1.29	$ 0.64

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-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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-Name Accounting Standards Codification
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