v3.2.0.727

Leasing Activities - Additional Information (Detail)	3 Months Ended		6 Months Ended
Leasing Activities - Additional Information (Detail)	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

The periods (in years) when the leases expire.

+ References

No definition available.

+ Details

Name:	dtipiv_LeasesExpirationDate
Namespace Prefix:	dtipiv_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of restaurants operated.

+ References

No definition available.

+ Details

Name:	dtipiv_NumberOfRestaurantsOperated
Namespace Prefix:	dtipiv_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Lease terms (in years).

+ References

No definition available.

+ Details

Name:	dtipiv_OperatingLeasePeriod
Namespace Prefix:	dtipiv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Combined, unaudited net income/ (loss) of restaurants.

+ References

No definition available.

+ Details

Name:	dtipiv_OperatingLeasesNetIncomeLoss
Namespace Prefix:	dtipiv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of gross sales due for monthly rentals.

+ References

No definition available.

+ Details

Name:	dtipiv_PercentageOfGrossSalesOfRestaurants
Namespace Prefix:	dtipiv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of properties subleased to a franchisee.

+ References

No definition available.

+ Details

Name:	dtipiv_SubleasedAssetsNumberOfUnits
Namespace Prefix:	dtipiv_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 25

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=7661868&loc=d3e34039-112682

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

+ Details

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

- Definition

The number of units (items of property) under operating lease arrangements.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Aggregate revenue during the period from sale of goods in the normal course of business, before deducting returns, allowances and discounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesRevenueGoodsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=dtipiv_DelTacoFranchiseeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

DEL TACO INCOME PROPERTIES IV 10-Q