Goodwill and other intangible assets - components of intangible assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,564,359	$ 1,612,646
Accumulated Amortization	(472,696)	(412,671)
Customer lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	622,428	621,078
Accumulated Amortization	(239,055)	(214,924)
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	16,532	58,908
Accumulated Amortization	0	0
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	519,962	522,374
Accumulated Amortization	(203,390)	(173,903)
Distribution rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	23,021	23,279
Accumulated Amortization	(15,239)	(14,393)
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	379,724	384,821
Accumulated Amortization	(13,974)	(8,929)
Noncompete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,692	2,186
Accumulated Amortization	$ (1,038)	$ (522)