Restructuring charges - Charges Recognized (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
Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	12,750	9,852
Facility Closure Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	59	123
Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	59	(108)
Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	77	101
2017 Vascular Solutions Integration Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,482
2017 Vascular Solutions Integration Program | Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,482
2017 Vascular Solutions Integration Program | Facility Closure Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
2017 Vascular Solutions Integration Program | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
2017 Vascular Solutions Integration Program | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
2017 EMEA Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	7,121
2017 EMEA Restructuring Program | Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	7,121
2017 EMEA Restructuring Program | Facility Closure Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
2017 EMEA Restructuring Program | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
2017 EMEA Restructuring Program | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
2016 Footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	509	10,347
2016 Footprint realignment plan | Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	539	10,347
2016 Footprint realignment plan | Facility Closure Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	12	0
2016 Footprint realignment plan | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(71)	0
2016 Footprint realignment plan | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	29	0
2014 Footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	311
2014 Footprint realignment plan | Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	303
2014 Footprint realignment plan | Facility Closure Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
2014 Footprint realignment plan | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
2014 Footprint realignment plan | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	8
2017 Other Restructuring program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	522
2017 Other Restructuring program | Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	305
2017 Other Restructuring program | Facility Closure Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	47
2017 Other Restructuring program | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	130
2017 Other Restructuring program | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 40
2016 Other Restructuring programs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(379)
2016 Other Restructuring programs | Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(495)
2016 Other Restructuring programs | Facility Closure Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		123
2016 Other Restructuring programs | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(108)
2016 Other Restructuring programs | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 101