Leasing Activities - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) Restaurants	Jun. 30, 2014 USD ($) Restaurants	Jun. 30, 2015 USD ($) Restaurants	Jun. 30, 2014 USD ($) 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
Minimum rentals due to partnership | $			$ 3,500
Number of restaurants operated	5		5
Combined unaudited sales | $	$ 1,535,348	$ 1,433,641	$ 3,039,610	$ 2,793,678
Combined unaudited net income (losses) | $	$ 47,416	9,079	$ 79,096	(2,654)
Del Taco franchisee [Member]
Operating Leased Assets [Line Items]
Number of restaurants operated	1		1
Combined unaudited sales | $	$ 245,353	$ 228,211	$ 486,509	$ 448,999