Document and Entity Information	6 Months Ended
	Jun. 30, 2011	Aug. 05, 2011
Entity Information [Line Items]
Entity Registrant Name	KBS Legacy Partners Apartment REIT, Inc.
Entity Central Index Key	0001469822
Current Fiscal Year end	--12-31
Entity Filer category	Smaller Reporting Company
Document type	10-Q
Document period end date	Jun. 30, 2011
Document fiscal year focus	2011
Document fiscal period focus	Q2
Amendment flag	false
Entity Common Stock, Shares Outstanding		1,692,785