Restructuring (credits) charges - Charges Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	$ (92)	$ 3,027	$ 13,723	$ 12,876
Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	(554)	2,784	12,807	12,027
Facility Closure Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	118	54	212	232
Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	104	107	238	114
Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	240	82	466	503
2017 Vascular Solutions integration program
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	(261)		4,626
2017 Vascular Solutions integration program | Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	(319)		4,534
2017 Vascular Solutions integration program | Facility Closure Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	0		0
2017 Vascular Solutions integration program | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	0		0
2017 Vascular Solutions integration program | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	58		92
2017 EMEA restructuring program
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	(630)		5,906
2017 EMEA restructuring program | Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	(714)		5,822
2017 EMEA restructuring program | Facility Closure Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	0		0
2017 EMEA restructuring program | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	0		0
2017 EMEA restructuring program | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	84		84
2016 Footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	431	925	1,332	11,279
2016 Footprint realignment plan | Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	274	851	1,099	10,919
2016 Footprint realignment plan | Facility Closure Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	72	0	94	0
2016 Footprint realignment plan | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	0	0	(75)	0
2016 Footprint realignment plan | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	85	74	214	360
2014 Footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	249	314	446
2014 Footprint realignment plan | Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	197	308	379
2014 Footprint realignment plan | Facility Closure Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	46	0	60
2014 Footprint realignment plan | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	0	0	0
2014 Footprint realignment plan | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	6	6	7
Other restructuring programs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	119	75	1,413	(15)
Other restructuring programs | Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	8	(88)	973	(487)
Other restructuring programs | Facility Closure Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	0	54	58	232
Other restructuring programs | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	104	107	313	114
Other restructuring programs | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges	$ 7	2	$ 69	126
2016 Other Restructuring programs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges		1,713		1,713
2016 Other Restructuring programs | Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges		1,713		1,713
2016 Other Restructuring programs | Facility Closure Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges		0		0
2016 Other Restructuring programs | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges		0		0
2016 Other Restructuring programs | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges		$ 0		0
2014 Footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges				(101)
2014 Footprint realignment plan | Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges				(118)
2014 Footprint realignment plan | Facility Closure Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges				0
2014 Footprint realignment plan | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges				0
2014 Footprint realignment plan | Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring (credits) charges				$ 17