Summary of Restructuring and Acquisition Related Expenses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 27, 2014	Jun. 28, 2013	Jun. 27, 2014	Jun. 28, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (188)	$ 722	$ (160)	$ 2,085
Total acquisition related charges	548	21	1,338	1,086
Total restructuring and acquisition related costs	360	743	1,178	3,171
JADAK
Restructuring Cost and Reserve [Line Items]
Total acquisition related charges	18		668
Earnout Agreement | JADAK
Restructuring Cost and Reserve [Line Items]
Total acquisition related charges	503		590
Acquisition Charges
Restructuring Cost and Reserve [Line Items]
Total acquisition related charges	45	21	748	1,086
GERMANY
Restructuring Cost and Reserve [Line Items]
Restructuring charges				7
2011 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(122)	385	(94)	1,322
2013 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (66)	$ 337	$ (66)	$ 756