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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
	Mar. 31, 2013
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive income (loss)	$ 1,845
United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011	1,918,756
Distributions	(43,488)
OP Unit Redemptions for common shares of UDR	0
Net income	7,774
Other comprehensive income (loss)	815
Net change in amount due to/(from) General Partner	26,312
Balance, September 30, 2012	1,910,169
Accumulated Other Comprehensive Income (Loss) [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011	(5,369)
Other comprehensive income (loss)	815
Balance, September 30, 2012	(4,554)
Total Partner's Capital [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011	1,917,299
Distributions	(43,488)
Net income	7,729
Other comprehensive income (loss)	815
Balance, September 30, 2012	1,882,355
Receivable Due From General Partner [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011	(11,056)
Net change in amount due to/(from) General Partner	26,312
Balance, September 30, 2012	15,256
Noncontrolling Interest [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011	12,513
Net income	45
Balance, September 30, 2012	12,558
Class A Limited Partner [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011	41,656
Distributions	(582)
Adjustment to reflect limited partners' capital at redemption value	(595)
Net income	73
Balance, September 30, 2012	40,552
Limited Partners [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011	181,762
Distributions	(1,780)
OP Unit Redemptions for common shares of UDR	(1,649)
Adjustment to reflect limited partners' capital at redemption value	(2,880)
Net income	318
Balance, September 30, 2012	175,771
Limited Partner [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011	1,698,027
Distributions	(41,100)
OP Unit Redemptions for common shares of UDR	1,649
Adjustment to reflect limited partners' capital at redemption value	3,475
Net income	7,333
Balance, September 30, 2012	1,669,384
General Partner [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, December 31, 2011	1,223
Distributions	(26)
Net income	5
Balance, September 30, 2012	1,202
Partnership Capital [Member] | United Dominion Reality L.P. [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
OP Unit Redemptions for common shares of UDR	0
Adjustment to reflect limited partners' capital at redemption value	$ 0

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Net change in receivable due from general partner.

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The consolidated profit or loss for the period including the portion attributable to the noncontrolling interest.

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Total distributions to each class of partners (i.e., general, limited and preferred partners).

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Total change in each class of partners' capital accounts during the year due to redemptions and adjustments to redemption value. All partners include general, limited and preferred partners.

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Amount of partners' capital (deficit), including portions attributable to both the parent and noncontrolling interests. Excludes temporary equity and is sometimes called permanent equity.

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