Schedule of Financial Performance by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information
Revenue	$ 3,122,378	$ 2,465,800	$ 8,873,893	$ 7,267,054
Segment EBITDA	326,344	267,035	963,531	863,164
Depreciation and amortization	81,473	59,902	210,977	166,508
North America
Segment Reporting Information
Revenue	1,262,799	1,181,943	3,927,808	3,596,697
Segment EBITDA	154,049	152,627	506,772	502,494
Depreciation and amortization	22,151	22,104	64,985	64,305
Europe
Segment Reporting Information
Revenue	1,470,856	954,522	3,795,439	2,665,170
Segment EBITDA	129,358	79,294	315,785	241,537
Depreciation and amortization	52,139	32,326	124,697	85,809
Specialty
Segment Reporting Information
Revenue	390,061	330,594	1,154,726	1,008,998
Segment EBITDA	42,937	35,114	140,974	119,133
Depreciation and amortization	7,183	5,472	21,295	16,394
Intersegment Eliminations [Member]
Segment Reporting Information
Revenue	(1,338)	(1,259)	(4,080)	(3,811)
Third Party [Member]
Segment Reporting Information
Revenue	3,122,378	2,465,800	8,873,893	7,267,054
Third Party [Member] \| North America
Segment Reporting Information
Revenue	1,262,657	1,181,756	3,927,282	3,596,108
Third Party [Member] \| Europe
Segment Reporting Information
Revenue	1,470,856	954,522	3,795,439	2,665,170
Third Party [Member] \| Specialty
Segment Reporting Information
Revenue	388,865	329,522	1,151,172	1,005,776
Intersegment [Member] \| North America
Segment Reporting Information
Revenue	142	187	526	589
Intersegment [Member] \| Specialty
Segment Reporting Information
Revenue	1,196	1,072	3,554	3,222
Intersegment [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information
Revenue	$ (1,338)	$ (1,259)	$ (4,080)	$ (3,811)

Segment EBITDA includes revenue and expenses that are controllable by the segment. Corporate and administrative expenses are allocated to the segments based on usage, with shared expenses apportioned based on the segment's percentage of consolidated revenue. Segment EBITDA excludes restructuring and acquisition related expenses, depreciation, amortization, interest, change in fair value of contingent consideration liabilities, taxes and equity in earnings of unconsolidated subsidiaries. Loss on debt extinguishment is considered a component of interest in calculating EBITDA, as the write-off of debt issuance costs is similar to the treatment of debt issuance cost amortization.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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