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Consolidated Statements of Changes in Capital (UNITED DOMINION REALTY, L.P) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive income (loss)	$ 364	$ 260
United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011		1,853,369
Distributions		(81,504)
Net loss		44,511
Other comprehensive income (loss)	149	312
Net change in receivable due from General Partner		137,515
Balance, June 30, 2012	1,954,203	1,954,203
Accumulated Other Comprehensive Income (Loss) [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011		(6,902)
Other comprehensive income (loss)		312
Balance, June 30, 2012	(6,590)	(6,590)
Total Partner's Capital [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011		2,034,792
Distributions		(81,504)
Net loss		44,246
Other comprehensive income (loss)		312
Balance, June 30, 2012	1,997,846	1,997,846
Receivable Due From General Partner [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011		(193,584)
Net change in receivable due from General Partner		137,515
Balance, June 30, 2012	(56,069)	(56,069)
Noncontrolling Interest [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011		12,161
Net loss		265
Balance, June 30, 2012	12,426	12,426
Class A Limited Partner [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011		43,967
Distributions		(1,164)
Adjustment to reflect limited partners' capital at redemption value		1,845
Net loss		615
Balance, June 30, 2012	45,263	45,263
Limited Partners [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011		192,508
Distributions		(3,373)
Adjustment to reflect limited partners' capital at redemption value		7,222
Net loss		1,831
Balance, June 30, 2012	198,042	198,042
Partners' Capital Account, Exchanges and Conversions	(146)
Limited Partner [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011		1,803,926
Distributions		(76,919)
Adjustment to reflect limited partners' capital at redemption value		(9,067)
Net loss		41,774
Balance, June 30, 2012	1,759,860	1,759,860
Partners' Capital Account, Exchanges and Conversions	146
General Partner [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011		1,293
Distributions		(48)
Net loss		26
Balance, June 30, 2012	$ 1,271	$ 1,271

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