Leasing Activities - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2013 Restaurants Property	Mar. 31, 2012 Restaurants
Operating Leased Assets [Line Items]
Number of restaurants leased to Del Taco	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	2021 to 2022
Minimum rentals due to Partnership	$ 3,500
Number of restaurants operated	2
Combined unaudited sales	551,995	539,570
Combined unaudited net losses	1,272	5,642
Del Taco franchisee [Member]
Operating Leased Assets [Line Items]
Number of restaurants operated	1
Combined unaudited sales	$ 317,916	$ 305,998

This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration