Goodwill and other intangible assets, net - Components of intangible assets (Details) - USD ($) $ in Thousands	Oct. 01, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 2,151,308	$ 1,564,359
Accumulated Amortization	(544,365)	(472,696)
In-process research and development
Finite-Lived Intangible Assets [Line Items]
In-process research and development	34,296	16,532
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	901,367	622,428
Accumulated Amortization	(269,447)	(239,055)
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	778,292	519,962
Accumulated Amortization	(238,236)	(203,390)
Distribution rights
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	23,637	23,021
Accumulated Amortization	(16,663)	(15,239)
Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	408,362	379,724
Accumulated Amortization	(18,343)	(13,974)
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	5,354	2,692
Accumulated Amortization	$ (1,676)	$ (1,038)