Leasing Activities - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014 Restaurants Property	Dec. 31, 2013 Property	Dec. 31, 2012 Property
Operating Leased Assets [Line Items]
Number of lease years	35 years
Percentage of gross sales of restaurants	12.00%
Leases expiration period	2020 to 2021
Minimum rentals due per month to Partnership	$ 3,500
Number of properties leased	6	6	6
Number of properties subleased to Del Taco franchisee	1
Number of restaurants operated	5
Combined unaudited sales	5,783,887	5,500,615	5,284,393
Combined unaudited net income (loss)	41,164	(20,169)	(22,807)
Del Taco franchisee [Member]
Operating Leased Assets [Line Items]
Number of restaurants operated	1
Combined unaudited sales	$ 930,225	$ 886,332	$ 863,302