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Related Party Transactions (UNITED DOMINION REALTY, L.P.) (Details) (USD $)	3 Months Ended	6 Months Ended			3 Months Ended		6 Months Ended				12 Months Ended		3 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2012 United Dominion Reality L.P. [Member]	Dec. 31, 2011 United Dominion Reality L.P. [Member]	Jun. 30, 2012 United Dominion Reality L.P. [Member] UDR, Inc. [Member]	Jun. 30, 2011 United Dominion Reality L.P. [Member] UDR, Inc. [Member]	Jun. 30, 2012 United Dominion Reality L.P. [Member] UDR, Inc. [Member]	Jun. 30, 2011 United Dominion Reality L.P. [Member] UDR, Inc. [Member]	Jun. 30, 2012 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Bottom Dollar Guarantee [Member]	Dec. 31, 2011 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Bottom Dollar Guarantee [Member]	Dec. 31, 2011 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Guaranty Related To Community Acquisition [Member]	Jun. 30, 2012 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Guaranty Related To Community Acquisition [Member]	Jun. 30, 2012 United Dominion Reality L.P. [Member] Taxable REIT Subsidiaries [Member]	Dec. 31, 2011 United Dominion Reality L.P. [Member] Taxable REIT Subsidiaries [Member]
Related Party Transaction [Line Items]
Net receivable balances from General Partner			$ (56,069,000)	$ (193,584,000)									$ (56,069,000)	$ (193,584,000)
General and administrative expenses allocated to the Operating Partnership by UDR					7,100,000	7,100,000	14,600,000	13,600,000
Related party management fee percentage													2.75%
Related party management fees	2,800,000	5,500,000
Related party guaranty note payable interest rate									1.998%	1.14%		5.337%
Notes payable due to General Partner			$ 88,771,000	$ 88,771,000					$ 83,300,000		$ 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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Number of Operating Partnership units issued in partial consideration for the acquisition of real estate during the period.

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General and administrative and other overhead services, including leagal assistance, acquisitions analysis, marketing and advertising incurred by the General Partnership and allocated to the Operating Partnership during the reporting period.

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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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Related Party Transaction, Note Payable, Interest Rate

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For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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