Schedule of Financial Performance by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information
Revenue	$ 2,465,800	$ 2,207,343	$ 7,267,054	$ 6,433,625
Segment EBITDA	267,035	246,439	863,164	782,653
Depreciation and amortization	59,902	55,036	166,508	142,170
North America
Segment Reporting Information
Revenue	1,181,943	1,118,621	3,596,697	3,336,847
Segment EBITDA	152,627	139,738	502,494	451,504
Depreciation and amortization	22,104	21,499	64,305	59,174
Europe
Segment Reporting Information
Revenue	954,522	770,219	2,665,170	2,141,186
Segment EBITDA	79,294	72,586	241,537	220,066
Depreciation and amortization	32,326	27,792	85,809	66,380
Specialty
Segment Reporting Information
Revenue	330,594	319,672	1,008,998	959,213
Segment EBITDA	35,114	34,115	119,133	111,083
Depreciation and amortization	5,472	5,745	16,394	16,616
Intersegment Eliminations
Segment Reporting Information
Revenue	(1,259)	(1,169)	(3,811)	(3,621)
Third Party \| North America
Segment Reporting Information
Revenue	1,181,756	1,118,421	3,596,108	3,336,240
Third Party \| Europe
Segment Reporting Information
Revenue	954,522	770,219	2,665,170	2,141,186
Third Party \| Specialty
Segment Reporting Information
Revenue	329,522	318,703	1,005,776	956,199
Intersegment \| North America
Segment Reporting Information
Revenue	187	200	589	607
Intersegment \| Europe
Segment Reporting Information
Revenue	0	0	0	0
Intersegment \| Specialty
Segment Reporting Information
Revenue	1,072	969	3,222	3,014
Intersegment \| Intersegment Eliminations
Segment Reporting Information
Revenue	$ (1,259)	$ (1,169)	$ (3,811)	$ (3,621)

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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- Definition

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=66902209&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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