Document and Entity Information	9 Months Ended
	Sep. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q3
Trading Symbol	DTIPIV
Entity Registrant Name	DEL TACO INCOME PROPERTIES IV
Entity Central Index Key	0000812630
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding	165,375