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
Leases [Abstract]
Number of restaurants leased to Del Taco | Restaurants	5	5	5	5
Number of lease years			35 years
Percentage of gross sales of restaurants			12.00%
Leases termination period			2021 to 2023
Minimum rentals due to partnership			$ 3,500
Number of restaurants operated | Restaurants	5		5
Combined unaudited sales	$ 1,246,067	$ 1,196,553	$ 3,732,695	$ 3,559,523
Combined unaudited net income (losses)	$ 15,215	$ (33,604)	$ 4,520	$ (77,015)