Retirement Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Retirement Plans [Line Items]
Defined contribution plan maximum employee contribution as a percentage of base salary	75.00%
Expense for the Company-sponsored defined contribution plan	$ 1,809,000	$ 1,754,000	$ 1,663,000
First 3% Of Contributions On Defined Contribution Plan
Retirement Plans [Line Items]
Defined contribution plan employer contribution as a percentage of base salary	100.00%
Threshold to determine company matching percentage	3.00%
Next 2% Of Contributions On Defined Contribution Plan
Retirement Plans [Line Items]
Defined contribution plan employer contribution as a percentage of base salary	50.00%
Threshold to determine company matching percentage	2.00%