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Debt (UNITED DOMINION REALTY, L.P.) (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended				3 Months Ended		12 Months Ended	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Fannie Mae [Member]	Mar. 31, 2012 Fannie Mae [Member]	Dec. 31, 2012 Fannie Mae [Member]	Mar. 31, 2013 United Dominion Reality L.P. [Member]	Mar. 31, 2013 United Dominion Reality L.P. [Member] Fannie Mae [Member]	Dec. 31, 2012 United Dominion Reality L.P. [Member] Fannie Mae [Member]	Mar. 31, 2013 Fixed Rate Debt [Member]	Mar. 31, 2013 Fixed Rate Debt [Member] Mortgages [Member]	Mar. 31, 2013 Fixed Rate Debt [Member] Line of Credit [Member]	Mar. 31, 2013 Fixed Rate Debt [Member] United Dominion Reality L.P. [Member]	Mar. 31, 2013 Fixed Rate Debt [Member] United Dominion Reality L.P. [Member] Mortgages [Member]	Mar. 31, 2013 Fixed Rate Debt [Member] United Dominion Reality L.P. [Member] Line of Credit [Member]	Mar. 31, 2013 Variable Rate Debt [Member]	Mar. 31, 2013 Variable Rate Debt [Member] Mortgages [Member]	Mar. 31, 2013 Variable Rate Debt [Member] Tax Exempt Notes Payable [Member]	Mar. 31, 2013 Variable Rate Debt [Member] Line of Credit [Member]	Mar. 31, 2013 Variable Rate Debt [Member] United Dominion Reality L.P. [Member]	Mar. 31, 2013 Variable Rate Debt [Member] United Dominion Reality L.P. [Member] Mortgages [Member]	Mar. 31, 2013 Variable Rate Debt [Member] United Dominion Reality L.P. [Member] Tax Exempt Notes Payable [Member]	Mar. 31, 2013 Variable Rate Debt [Member] United Dominion Reality L.P. [Member] Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	4 years 2 months 26 days				4 years 11 months 26 days			4 years 7 months 19 days	3 years 3 months 3 days	5 years 6 months 29 days	4 years 6 months 25 days	3 years 3 months 3 days	5 years 11 months 19 days	6 years 1 month 14 days	3 months	9 years 11 months 8 days	5 years 4 months 2 days	6 years 6 months 14 days	3 months	18 years 11 months 19 days	5 years 9 months 18 days
Borrowings outstanding	$ 840,500	$ 840,472		$ 842,487		$ 507,621	$ 507,825
Weighted average daily borrowings during the period ended		840,921	903,817			507,893	544,793
Maximum daily borrowings during the period ended		$ 841,494	$ 1,054,735			$ 508,239	$ 635,762
Weighted average interest rate during the period ended		4.40%	4.30%				4.30%
Interest rate at the end of the period		4.30%		4.40%			4.40%

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Debt instrument weighted average years to maturity.

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Amount borrowed under the credit facility as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The effective interest rate at the end of the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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