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Related Party Transactions (UNITED DOMINION REALTY, L.P.) (Details) - Long-term Debt, Type [Domain] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Related Party Transaction [Line Items]
Related party management fees	$ 4,300	$ 3,100	$ 8,600	$ 6,200
United Dominion Reality L.P. [Member]
Related Party Transaction [Line Items]
Limited partnership units owned	183,167,815		183,167,815		183,167,815
Net receivable balances from General Partner	$ 2,956		$ 2,956		$ 13,624
Related Party Transaction, Management Fee Percentage			2.75%
Interest Expense, Related Party	1,151	1,151	$ 2,302	2,302
Notes payable due to General Partner	88,696		88,696		88,696
United Dominion Reality L.P. [Member] | Taxable REIT Subsidiaries [Member]
Related Party Transaction [Line Items]
Net receivable balances from General Partner	(2,956)		$ (2,956)		(13,624)
Related Party Transaction, Management Fee Percentage			2.75%
United Dominion Reality L.P. [Member] | UDR, Inc. [Member]
Related Party Transaction [Line Items]
General and administrative expenses allocated to the Operating Partnership by UDR	$ 5,700	$ 7,200	$ 9,900	$ 13,900
United Dominion Reality L.P. [Member] | UDR, Inc. [Member] | Bottom Dollar Guaranty [Member]
Related Party Transaction [Line Items]
Notes payable due to General Partner					$ 88,700
Note for 83.2 million [Member] | United Dominion Reality L.P. [Member] | UDR, Inc. [Member] | Guaranty Related To Community Acquisition [Member]
Related Party Transaction [Line Items]
Related party guaranty note payable interest rate	5.18%		5.18%
Debt Instrument, Maturity Date Range, End			Aug. 31, 2021
Note for 5 million [Member] | United Dominion Reality L.P. [Member] | UDR, Inc. [Member] | Guaranty Related To Community Acquisition [Member]
Related Party Transaction [Line Items]
Related party guaranty note payable interest rate	5.34%		5.34%
Debt Instrument, Maturity Date Range, End			Dec. 31, 2023

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