Restructuring charges - Charges by segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2017	Mar. 27, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 12,945	$ 9,968
Vascular North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	748	4,163
Anesthesia North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	247	1,875
Surgical North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	(19)
EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring charges	7,500	3,872
Asia
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	2
OEM
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	4
All Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4,450	$ 71