Leasing Activities - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014 Restaurants	Sep. 30, 2013 Restaurants	Sep. 30, 2014 Restaurants	Sep. 30, 2013 Restaurants
Operating Leased Assets [Line Items]
Number of restaurants leased to Del Taco	3	3	3	3
Number of properties subleased to Del Taco franchisee			1
Number of lease years			32 years
Percentage of gross sales of restaurants			12.00%
Leases expiration period			2021 to 2022
Minimum rentals due to partnership			$ 3,500
Number of restaurants operated	2		2
Combined unaudited sales	616,717	586,926	1,802,890	1,716,457
Combined unaudited net income (losses)	6,037	(5,195)	8,807	(5,700)
Del Taco franchisee [Member]
Operating Leased Assets [Line Items]
Number of restaurants operated	1		1
Combined unaudited sales	$ 370,819	$ 337,015	$ 1,062,658	$ 993,862