Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2012	Jun. 29, 2012	Mar. 07, 2013 Class E [Member]	Mar. 07, 2013 Class A [Member]	Mar. 07, 2013 Class M [Member]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2012
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2012
Entity Registrant Name	Jones Lang LaSalle Income Property Trust, Inc.
Entity Central Index Key	0001314152
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding			26,444,843	5,112,988	789,662
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Public Float		$ 234,732,351