Basis of Presentation - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012 Restaurant	Sep. 30, 2011 Restaurant
Significant Accounting Policies [Line Items]
Number of restaurants closed			4	4
Losses in connection with the sale of restaurants			$ (27,000)
Other income (expense)	(1,000)	(11,000)
Lease liability	$ 79,000