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Document and Entity Information (USD $) In Billions, except Share data	6 Months Ended			6 Months Ended
	Jun. 30, 2011	Jul. 29, 2011	Jun. 30, 2010	Jun. 30, 2011 United Dominion Reality.L.P [Member]	Aug. 31, 2011 United Dominion Reality.L.P [Member]	Jun. 30, 2010 United Dominion Reality.L.P [Member]
Entity Registrant Name	UDR, Inc.			UNITED DOMINION REALTY L P
Entity Central Index Key	0000074208			0001018254
Document Type	10-Q			10-Q
Document Period End Date	Jun. 30, 2011			Jun. 30, 2011
Amendment Flag	false			false
Document Fiscal Year Focus	2011			2011
Document Fiscal Period Focus	Q2			Q2
Current Fiscal Year End Date	--12-31			--12-31
Entity Well-known Seasoned Issuer	Yes			No
Entity Voluntary Filers	No			No
Entity Current Reporting Status	Yes			Yes
Entity Filer Category	Large Accelerated Filer			Non-accelerated Filer
Entity Public Float			$ 1.9			$ 0
Entity Common Stock, Shares Outstanding		219,079,564			0