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 lease years	35 years
Percentage of gross sales of the restaurants	12.00%
Leases expiration date	2020 to 2021
Number of properties leased	6	6
Number of properties subleased to Del Taco franchisee	1
Minimum rentals due per month to Partnership	$ 3,500
Combined unaudited sales	1,302,767	1,285,350
Combined unaudited net losses	10,361	9,747
Number of restaurants operated	5
Del Taco franchisee [Member]
Operating Leased Assets [Line Items]
Combined unaudited sales	$ 205,739	$ 210,006
Number of restaurants operated	1

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

-Publisher FASB

-Name Accounting Standards Codification

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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