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Related Party Transactions (UNITED DOMINION REALTY, L.P.) (Details) (USD $)	3 Months Ended				3 Months Ended		3 Months Ended				3 Months Ended			3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 United Dominion Reality L.P. [Member]	Dec. 31, 2012 United Dominion Reality L.P. [Member]	Mar. 31, 2013 United Dominion Reality L.P. [Member] Taxable REIT Subsidiaries [Member]	Mar. 31, 2012 United Dominion Reality L.P. [Member] Taxable REIT Subsidiaries [Member]	Mar. 31, 2013 United Dominion Reality L.P. [Member] UDR, Inc. [Member]	Mar. 31, 2012 United Dominion Reality L.P. [Member] UDR, Inc. [Member]	Mar. 31, 2013 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Bottom Dollar Guaranty [Member]	Dec. 31, 2012 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Bottom Dollar Guaranty [Member]	Mar. 31, 2012 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Guaranty related to community acquisition [Member]	Mar. 31, 2013 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Guaranty related to community acquisition [Member]	Dec. 31, 2012 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Guaranty related to community acquisition [Member]	Mar. 31, 2013 Bottom Dollar Guaranty [Member] Fixed Rate Debt [Member] United Dominion Reality L.P. [Member]
Related Party Transaction [Line Items]
Net receivable balances from General Partner			$ 15,256,000	$ (11,056,000)	$ (15,256,000)	$ 11,056,000
General and administrative expenses allocated to the Operating Partnership by UDR							5,300,000	7,500,000
Related Party Transaction, Management Fee Percentage			2.75%		2.75%
Related party management fees	3,000,000	2,700,000
Related party guaranty note payable interest rate									0.932%	0.93%		5.337%
Debt Instrument, Maturity Date Range, End														Aug. 31, 2021
Notes payable due to General Partner			$ 88,696,000	$ 88,696,000					$ 83,200,000	$ 83,200,000		$ 5,500,000	$ 5,500,000
Number of OP Units issued as consideration for acquisition guaranteed by related party note payable (in shares)											1,802,239

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Percentage of the Operating Partnership's gross rental revenues that are charged by Taxable REIT Subisidiaries of the General Partner for management fee during the period.

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Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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