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Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Summary of carrying amounts for real estate owned (at cost)
Land	$ 1,856,026	$ 1,821,762
Depreciable property - held and used:
Building and improvements	5,362,012	5,203,484
Furniture, fixtures and equipment	261,201	244,101
Under development:
Under development	282,006	246,229
Real estate owned	7,761,245	8,074,471
Accumulated depreciation	(1,769,530)	(1,831,727)
Total real estate owned, net of accumulated depreciation	5,991,715	6,242,744
Land [Member]
Held for sale:
Held for sale	0	98,340
Under development:
Under development	104,105	115,198
Building and improvements [Member]
Held for sale:
Held for sale	0	410,123
Furniture, fixtures and equipment [Member]
Held for sale:
Held for sale	0	49,862
Construction in Progress [Member]
Under development:
Under development	177,901	131,601
United Dominion Reality L.P. [Member]
Summary of carrying amounts for real estate owned (at cost)
Land	1,013,083	1,008,077
Depreciable property - held and used:
Building and improvements	2,978,823	2,942,125
Furniture, fixtures and equipment	115,687	111,392
Under development:
Under development	30,365	26,793
Land held for future development	1,300	1,300
Real estate owned	4,139,258	4,205,298
Accumulated depreciation	(1,015,594)	(976,358)
Total real estate owned, net of accumulated depreciation	3,123,664	3,228,940
United Dominion Reality L.P. [Member] | Land [Member]
Held for sale:
Held for sale	0	13,449
Under development:
Under development	16,385	16,385
United Dominion Reality L.P. [Member] | Building and improvements [Member]
Held for sale:
Held for sale	0	93,127
United Dominion Reality L.P. [Member] | Furniture, fixtures and equipment [Member]
Held for sale:
Held for sale	0	9,035
United Dominion Reality L.P. [Member] | Construction in Progress [Member]
Under development:
Under development	$ 13,980	$ 10,408

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The net book value of real estate held for investment and real estate under development.

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Real Estate Owned Gross.

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The current amount of expenditures for a real estate project that has not yet been completed.

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Gross amount, at the balance sheet date, of long-lived, depreciable assets commonly used in offices and stores. Examples include desks, chairs, and store fixtures.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

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Carrying amount as of the balance sheet date of real estate held for productive use. This excludes land held for sale.

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Carrying amount of land available for development.

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The amount as of the balance sheet date of accumulated depreciation pertaining to real estate properties.

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Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

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