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Related Party Transactions (UNITED DOMINION REALTY, L.P.) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended	3 Months Ended		9 Months Ended			9 Months Ended		3 Months Ended		9 Months Ended	12 Months Ended				9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2014 United Dominion Reality L.P. [Member]	Sep. 30, 2013 United Dominion Reality L.P. [Member]	Sep. 30, 2014 United Dominion Reality L.P. [Member]	Sep. 30, 2013 United Dominion Reality L.P. [Member]	Dec. 31, 2013 United Dominion Reality L.P. [Member]	Sep. 30, 2014 United Dominion Reality L.P. [Member] Taxable REIT Subsidiaries [Member]	Dec. 31, 2013 United Dominion Reality L.P. [Member] Taxable REIT Subsidiaries [Member]	Sep. 30, 2014 United Dominion Reality L.P. [Member] UDR, Inc. [Member]	Sep. 30, 2013 United Dominion Reality L.P. [Member] UDR, Inc. [Member]	Sep. 30, 2014 United Dominion Reality L.P. [Member] UDR, Inc. [Member]	Dec. 31, 2012 United Dominion Reality L.P. [Member] UDR, Inc. [Member]	Sep. 30, 2014 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Bottom Dollar Guaranty [Member]	Dec. 31, 2013 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Bottom Dollar Guaranty [Member]	Sep. 30, 2014 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Guaranty Related To Community Acquisition [Member]	Sep. 30, 2014 Fixed Rate Debt [Member] United Dominion Reality L.P. [Member] Guaranty Related To Community Acquisition [Member]	Sep. 30, 2014 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						$ 795,000		$ 795,000		$ (9,916,000)	$ (795,000)	$ 9,916,000
General and administrative expenses allocated to the Operating Partnership by UDR													6,600,000	6,500,000	20,500,000	17,400,000
Related Party Transaction, Management Fee Percentage								2.75%			2.75%
Related party management fees	3,200,000	3,100,000	9,400,000		9,100,000
Related party guaranty note payable interest rate																	5.18%		5.337%
Debt Instrument, Maturity Date Range, End																				Aug. 31, 2021	Dec. 31, 2023
Interest Expense, Related Party	1,200,000	3,500,000	300,000	800,000		1,151,000	267,000	3,453,000	801,000
Notes payable due to General Partner						$ 88,696,000		$ 88,696,000		$ 88,696,000							$ 88,700,000	$ 88,700,000

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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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