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	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
Minimum rentals due to partnership | $			$ 3,500
Number of restaurants operated	2		2
Combined unaudited sales | $	$ 623,673	$ 604,336	$ 1,236,537	$ 1,186,173
Combined unaudited net income | $	$ 27,057	7,172	$ 37,401	2,770
Del Taco franchisee [Member]
Operating Leased Assets [Line Items]
Number of restaurants operated	1		1
Combined unaudited sales | $	$ 389,191	$ 359,323	$ 758,645	$ 691,838