Share Based Compensation Expense in Statements of Operations (Detail) (2010 Incentive Award Plan, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Share Based Compensation [Line Items]
Share based compensation expense	$ 1,344	$ 1,207	$ 4,212	$ 3,530
Selling, general and administrative
Share Based Compensation [Line Items]
Share based compensation expense	1,264	1,102	3,993	3,342
Research and development and engineering
Share Based Compensation [Line Items]
Share based compensation expense	48	31	129	80
Cost of Sales
Share Based Compensation [Line Items]
Share based compensation expense	32	23	90	57
Restructuring and other
Share Based Compensation [Line Items]
Share based compensation expense		$ 51		$ 51