Total Compensation Expense by Type of Award (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense	$ 712	$ 486	$ 2,005	$ 1,647
Stock awards, service-based
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense	138	124	376	373
Stock awards, performance-based
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense (credit)	306	(9)	669	233
Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense	$ 268	$ 371	$ 960	$ 1,041