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Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Roll Forward]
Beginning balance	$ 2,288,895	$ 1,937,444	$ 1,690,284
Business acquisitions and adjustments to previously recorded goodwill	92,175	415,703	235,447
Exchange rate effects	(61,824)	(64,252)	11,713
Ending balance	2,319,246	2,288,895	1,937,444
North America
Goodwill [Roll Forward]
Beginning balance	1,392,032	1,358,937	1,339,831
Business acquisitions and adjustments to previously recorded goodwill	72,355	43,752	27,035
Exchange rate effects	(18,537)	(10,657)	(7,929)
Ending balance	1,445,850	1,392,032	1,358,937
Europe
Goodwill [Roll Forward]
Beginning balance	616,819	578,507	350,453
Business acquisitions and adjustments to previously recorded goodwill	21,217	91,916	208,412
Exchange rate effects	(43,554)	(53,604)	19,642
Ending balance	594,482	616,819	578,507
Specialty
Goodwill [Roll Forward]
Beginning balance	280,044	0	0
Business acquisitions and adjustments to previously recorded goodwill	(1,397)	280,035	0
Exchange rate effects	267	9	0
Ending balance	$ 278,914	$ 280,044	$ 0

X

- Definition

The aggregate amount of goodwill acquired in the period and purchase price allocation adjustments for acquisitions made in prior periods. The value is stated at fair value based on the purchase price allocation.

+ References

No definition available.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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