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Income/(Loss) Per Operating Partnership Unit (UNITED DOMINION REALTY, L.P.) Income/(Loss) Per Operating Partnership Unit (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014 instruments	Sep. 30, 2013 instruments	Sep. 30, 2014 instruments	Sep. 30, 2013 instruments	Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of Dilutive Instruments	0	0	0	0
Numerator for earnings per OP unit - basic and diluted:
Income/(loss) from continuing operations	$ 10,611	$ 2,351	$ 9,775	$ 5,713
Gains/(loss) on sales of real estate, net of tax	31,302	0	82,305	0
(Income)/loss from continuing operations attributable to noncontrolling interest			3,167
Income/(loss) from continuing operations attributable to OP unitholders	40,476	2,336	88,911		5,637
Income/(loss) from discontinued operations, net of tax	79	884	10	2,567	2,567
(Income)/loss from discontinued operations attributable to noncontrolling interest	(6)	(32)	(4)		(92)
Income (loss) from discontinued operations attributable to OP unitholders	73	852	6	2,475
Net income/(loss)	41,992	3,235	92,090	8,280
Net (income)/loss attributable to noncontrolling interests	1,500	92	3,336	364
Net income/(loss) attributable to OP unitholders	40,549	3,188	88,917	8,112	8,112
United Dominion Reality L.P. [Member]
Numerator for earnings per OP unit - basic and diluted:
Income/(loss) from continuing operations	8,875	10,072	23,606	26,278
Gains/(loss) on sales of real estate, net of tax	0	0	40,687	0
(Income)/loss from continuing operations attributable to noncontrolling interest	(238)	(39)	(697)	(151)
Income/(loss) from continuing operations attributable to OP unitholders	8,637	10,033	63,596	26,127
Income/(loss) from discontinued operations, net of tax	0	978	0	2,766
(Income)/loss from discontinued operations attributable to noncontrolling interest	0	0	0	0
Income (loss) from discontinued operations attributable to OP unitholders	0	978	0	2,766
Net income/(loss)	8,875	11,050	64,293	29,044
Net (income)/loss attributable to noncontrolling interests	238	39	697	151
Net income/(loss) attributable to OP unitholders	$ 8,637	$ 11,011	$ 63,596	$ 28,893	$ 28,893
Denominator for earnings per OP unit - basic and diluted
Weighted average OP units outstanding	183,279	184,281	183,279	184,281
Income/(loss) from continuing operations attributable to OP unitholders (in dollars per share)	$ 0.05	$ 0.05	$ 0.35	$ 0.14
Income/(loss) from discontinued operations (in dollars per share)	$ 0.00	$ 0.01	$ 0.00	$ 0.02
Net income/(loss) attributable to OP unitholders (in dollars per share)	$ 0.05	$ 0.06	$ 0.35	$ 0.16

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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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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Amount of income (loss) from continuing operations attributable to the noncontrolling interest. 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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The amount of net income (loss) from continuing operations per each basic and diluted limited partnership and general partnership unit when the per unit amount is the same for both basic and diluted units.

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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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The amount of income (loss) derived from discontinued operations during the period, net of related tax effect, per each basic and diluted limited partnership and general partnership unit when the per unit amount is the same for both basic and diluted units.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The amount of net income or loss for the period per each limited partnership and general partnership unit in instances when basic and diluted earnings per unit are the same amount and aggregated on the face of the financial statements. Basic earnings per unit is the amount of net income or loss for the period per unit outstanding during the reporting period. Diluted earnings per unit includes the amount of net income or loss for the period available to each limited and general partnership unit outstanding during the reporting period and to each unit that would have been outstanding assuming the issuance of units for all dilutive potential units outstanding during the reporting period.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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