General form of registration statement for all companies including face-amount certificate companies

Rent Expense Excluding Real Estate Taxes CAM Charges Insurance Deferred Lease Incentives and Other Expenses Related to Operating Leases (Detail)

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Rent Expense Excluding Real Estate Taxes CAM Charges Insurance Deferred Lease Incentives and Other Expenses Related to Operating Leases (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 23, 2012
Sep. 25, 2011
Dec. 25, 2011
Dec. 26, 2010
Dec. 27, 2009
Minimum And Contingent Rental Expense [Line Items]          
Total minimum and contingent rent expense $ 6,190 $ 4,712 $ 6,446 $ 4,750 $ 3,607
Related Parties
          
Minimum And Contingent Rental Expense [Line Items]          
Minimum rent expense 1,388 1,312 1,749 1,663 1,622
Contingent rent expense 177 181 472 409 420
Total minimum and contingent rent expense 1,565 1,493 2,221 2,072 2,042
Non Related Party
          
Minimum And Contingent Rental Expense [Line Items]          
Minimum rent expense 4,234 2,830 4,028 2,582 1,483
Contingent rent expense 391 389 197 96 82
Total minimum and contingent rent expense $ 4,625 $ 3,219 $ 4,225 $ 2,678 $ 1,565