Earnings Per Operating Partnership Unit (UNITED DOMINION REALTY, L.P.) Earnings/(Loss) Per Operating Partnership Unit (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2013 instruments	Jun. 30, 2012	Jun. 30, 2013 instruments	Jun. 30, 2012	Dec. 31, 2010
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of Dilutive Instruments	0		0
Numerator for earnings per OP unit - basic and diluted:
Income/(loss) from continuing operations	$ 5,354	$ (23,123)	$ 5,045	$ (21,382)
Income (loss) from continuing operations attributable to noncontrolling interest			(114)
Income (loss) from continuing operations attributable to OP unitholders	5,192	(22,291)	4,924	(20,671)
Income (loss) from discontinued operations, net	0	179,429	0	264,316	0
Income (loss) from discontinued operations attributable to noncontrolling interest	0	(6,786)	0	(10,137)
Income (loss) from discontinued operations attributable to OP unitholders	0	172,643	0	254,179
Net (loss)/income	5,354	156,306	5,045	242,934
Net income attributable to non-controlling interests	226	5,983	272	9,388
Net income (loss) attributable to OP unitholders	5,192	150,352	4,924	233,508
United Dominion Reality L.P. [Member]
Numerator for earnings per OP unit - basic and diluted:
Income/(loss) from continuing operations	10,220	(1,969)	17,994	(9,783)
Income (loss) from continuing operations attributable to noncontrolling interest	(66)	(44)	(112)	(78)
Income (loss) from continuing operations attributable to OP unitholders	10,154	(2,013)	17,882	(9,861)
Income (loss) from discontinued operations, net	0	53,372	0	54,294
Income (loss) from discontinued operations attributable to noncontrolling interest	0	(187)	0	(187)
Income (loss) from discontinued operations attributable to OP unitholders	0	53,185	0	54,107
Net (loss)/income	10,220	51,403	17,994	44,511
Net income attributable to non-controlling interests	(66)	(231)	(112)	(265)
Net income (loss) attributable to OP unitholders	$ 10,154	$ 51,172	$ 17,882	$ 44,246
Denominator for earnings per OP unit - basic and diluted
Weighted average OP units outstanding	184,281	184,281	184,281	184,281
Loss from continuing operations attributable to OP unitholders (in dollars per share)	$ 0.06	$ (0.01)	$ 0.10	$ (0.05)
Income from discontinued operations (in dollars per share)	$ 0.00	$ 0.29	$ 0.00	$ 0.29
Net loss attributable to OP unitholders (in dollars per share)	$ 0.06	$ 0.28	$ 0.10	$ 0.24

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The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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