Total Compensation Expense by Type of Award (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense	$ 590	$ 695	$ 1,292	$ 1,161
Service-Based Stock Awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense	178	137	238	249
Performance-Based Stock Awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense	224	143	362	242
Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense	$ 188	$ 415	$ 692	$ 670