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Income/(Loss) Per Share (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	[1]	Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	[1]	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest															$ 48
Income (Loss) from Continuing Operations Attributable to Parent													$ 340,383	$ 154,324	2,448
Income/(loss) from discontinued operations									$ 0	$ 79	$ 18	$ (87)	0	10	43,942
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest													357,159	159,842	46,282
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest													16,468	5,375	1,720
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest													0	0	(1,578)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent													0	10	42,364
United Dominion Reality L.P.
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (Loss) from Continuing Operations Attributable to Parent													213,301	96,227	28,652
Income/(loss) from discontinued operations													0	0	45,176
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest													215,063	97,179	77,942
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest													$ 1,762	$ 952	$ 4,566
Weighted Average Number of Limited Partnership and General Partnership Unit Outstanding, Basic and Diluted													183,279	183,279	184,196
Income (Loss) from Continuing Operations, Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax													$ 1.16	$ 0.53	$ 0.16
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted													0.00	0.00	0.24
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax	$ 0.62		$ 0.08		$ 0.26		$ 0.20		$ 0.18	$ 0.05	$ 0.13	$ 0.17	$ 1.16	$ 0.53	$ 0.40
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest													$ 0	$ 0	$ (452)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent													$ 0	$ 0	44,724
Noncontrolling Interest | United Dominion Reality L.P.
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest															$ (4,114)
[1] Quarterly income/(loss) per OP Unit amounts may not total to the annual amounts

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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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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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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 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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The average number of limited partnership and general partnership units issued and outstanding that are used in calculating basic and diluted earnings per limited partnership and general partnership unit.

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