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Goodwill and other intangible assets - changes in carrying amount by reporting segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill			$ 2,567,720
Accumulated impairment losses			(332,128)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 2,246,579	$ 2,235,592
Goodwill related to acquisitions	1,833	40,665
Translation and other adjustments	(3,107)	(29,678)
Goodwill, ending balance	2,245,305	2,246,579
Americas
Goodwill [Line Items]
Goodwill			1,859,089
Accumulated impairment losses			(332,128)
Goodwill [Roll Forward]
Goodwill, beginning balance	1,549,534	1,526,961
Goodwill related to acquisitions	439	29,345
Translation and other adjustments	952	(6,772)
Goodwill, ending balance	1,550,925	1,549,534
EMEA
Goodwill [Line Items]
Goodwill			494,548
Accumulated impairment losses			0
Goodwill [Roll Forward]
Goodwill, beginning balance	480,615	494,548
Goodwill related to acquisitions	189	4,730
Translation and other adjustments	(5,032)	(18,663)
Goodwill, ending balance	475,772	480,615
Asia
Goodwill [Line Items]
Goodwill			209,200
Accumulated impairment losses			0
Goodwill [Roll Forward]
Goodwill, beginning balance	211,547	209,200
Goodwill related to acquisitions	1,205	6,590
Translation and other adjustments	973	(4,243)
Goodwill, ending balance	213,725	211,547
OEM
Goodwill [Line Items]
Goodwill			4,883
Accumulated impairment losses			$ 0
Goodwill [Roll Forward]
Goodwill, beginning balance	4,883	4,883
Goodwill related to acquisitions	0	0
Translation and other adjustments	0	0
Goodwill, ending balance	$ 4,883	$ 4,883

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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.

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