Commitments and Contingencies (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 25, 2011	Sep. 25, 2011
Loss Contingencies [Line Items]
Estimated amount of undiscounted payments, maximum	$ 2,500,000	$ 2,500,000
Other general expenses, remaining rentals, taxes and insurance related to leases	$ 782,000	$ 782,000
Restaurant Sites [Member]
Loss Contingencies [Line Items]
Number of lease agreements the company is contingently liable	40	40
Latest Expiration [Member]
Loss Contingencies [Line Items]
Lease expiration, year	2017	2017
Majority Expiration [Member]
Loss Contingencies [Line Items]
Lease expiration, year	2014	2014