Restructuring charges and impairment charges - Charges By Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,964	$ (92)	$ 58,515	$ 13,723
Vascular North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	203	582	725	1,663
Interventional North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(26)	(228)	881	4,178
Anesthesia North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	38	220	164	1,031
EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,520	(632)	54,310	6,483
All Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 229	$ (34)	$ 2,435	$ 368