Restructuring charges - Charges by segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3,027	$ 660	$ 12,876	$ 5,688
Vascular North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	960	232	5,474	2,466
Anesthesia North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	946	(250)	3,185	284
Surgical North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	277	36	257	282
EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring charges	89	(64)	3,012	(139)
Asia
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	2	0	3
OEM
Restructuring Cost and Reserve [Line Items]
Restructuring charges	187	0	191	0
All Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 568	$ 704	$ 757	$ 2,792