Leasing Activities - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) Restaurants	Sep. 30, 2014 USD ($) Restaurants	Sep. 30, 2015 USD ($) Restaurants	Sep. 30, 2014 USD ($) Restaurants
Operating Leased Assets [Line Items]
Number of restaurants leased to Del Taco	6	6	6	6
Number of properties subleased to Del Taco franchisee			1
Number of lease years			35 years
Percentage of gross sales of restaurants			12.00%
Leases expiration period			2020 to 2021
Minimum rentals due to partnership | $			$ 3,500
Number of restaurants operated	5		5
Combined unaudited sales | $	$ 1,557,593	$ 1,489,919	$ 4,597,203	$ 4,283,597
Combined unaudited net income (losses) | $	$ 58,355	15,164	$ 137,452	12,510
Del Taco franchisee [Member]
Operating Leased Assets [Line Items]
Number of restaurants operated	1		1
Combined unaudited sales | $	$ 255,640	$ 237,555	$ 742,149	$ 686,554