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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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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Carrying amount as of the balance sheet date of real estate held for productive use. This excludes land held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6812-107765 + Details
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