Net revenues Other revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Net revenues	$ 641,615	$ 609,672	$ 609,866	$ 587,230	$ 595,106	$ 534,703	$ 528,613	$ 487,881	$ 2,448,383	$ 2,146,303	$ 1,868,027
Vascular access
Disaggregation of Revenue [Line Items]
Net revenues									575,327	540,234
Anesthesia
Disaggregation of Revenue [Line Items]
Net revenues									349,370	344,599
Interventional
Disaggregation of Revenue [Line Items]
Net revenues									395,423	324,681
Surgical
Disaggregation of Revenue [Line Items]
Net revenues									358,707	356,156
Interventional urology
Disaggregation of Revenue [Line Items]
Net revenues									196,735	38,957
OEM
Disaggregation of Revenue [Line Items]
Net revenues									205,976	182,967
Other
Disaggregation of Revenue [Line Items]
Net revenues									$ 366,845	$ 358,709