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Discontinued Operations (UNITED DOMINION REALTY, L.P.) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended		3 Months Ended		9 Months Ended			12 Months Ended	3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014 United Dominion Reality L.P. [Member]	Sep. 30, 2013 United Dominion Reality L.P. [Member]	Sep. 30, 2014 United Dominion Reality L.P. [Member]	Sep. 30, 2013 United Dominion Reality L.P. [Member]	Sep. 30, 2013 United Dominion Reality L.P. [Member]	Dec. 31, 2013 United Dominion Reality L.P. [Member]	Sep. 30, 2014 Operating Community [Member]	Sep. 30, 2014 Operating Community [Member]	Sep. 30, 2014 Operating Community [Member] United Dominion Reality L.P. [Member]	Mar. 31, 2014 Land [Member]	Sep. 30, 2014 Land [Member]
Entity Information [Line Items]
Gains/(loss) on sales of real estate, net of tax	$ 31,302,000	$ 0	$ 82,305,000	$ 0			$ 0	$ 0	$ 40,687,000		$ 0
Gain (Loss) on Disposition of Property Plant Equipment	100,000		82,400,000						24,400,000				31,300,000	81,200,000	39,600,000	1,100,000	1,100,000
Discontinued Operations (Textual) [Abstract]
Communities sold (in communities)			6	0	2				1	0	0	2		1
Communities held for sale (in communities)	1		1
Summary of income from discontinued operations
Rental income	21,000	2,462,000	147,000	7,130,000			0	2,438,000	0		7,016,000
Rental expenses	11,000	970,000	225,000	2,733,000			0	869,000	0		2,467,000
Property management	1,000	68,000	4,000	196,000			0	67,000	0		193,000
Real estate depreciation	0	528,000	0	1,608,000			0	524,000	0		1,590,000
Income/(loss) from discontinued operations	79,000	884,000	10,000	2,567,000		2,567,000	0	978,000	0		2,766,000
Income (loss) from discontinued operations attributable to OP unitholders	$ 73,000	$ 852,000	$ 6,000	$ 2,475,000			$ 0	$ 978,000	$ 0		$ 2,766,000
Apartment Homes Sold			1,904		914							914

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The aggregate total of property management fee expense that is attributable to the disposal group.

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The aggregate total of rental expenses that is attributable to the disposal group.

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Amount of depreciation and amortization attributable to disposal group.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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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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