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Discontinued Operations (UNITED DOMINION REALTY, L.P.) (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 Apartment_Homes Communities | Jun. 30, 2011 Apartment_Homes Communities | Jun. 30, 2012 Apartment_Homes Communities | Jun. 30, 2011 Communities Apartment_Homes
Discontinued Operations (Textual) [Abstract] |  |  |  |
Communities sold (in communities) | 15 | 7 | 21 | 6
Apartment homes sold (in apartment homes) | 4,931 | 1,707 | 6,507 | 1,418
Communities held for sale (in communities) | 0 |  | 0 |
Summary of income from discontinued operations |  |  |  |
Rental income | $ 13,215,000 | $ 26,581,000 | $ 30,316,000 | $ 59,271,000
Rental expenses | 4,637,000 | 9,989,000 | 10,566,000 | 22,102,000
Property management fee | 364,000 | 731,000 | 834,000 | 1,630,000
Other operating expenses | 0 | 0 | 0 | 23,000
Real estate depreciation | 0 | 11,253,000 | 6,340,000 | 25,153,000
Interest | 0 | 184,000 | 0 | 1,744,000
Total expenses | 5,792,000 | 22,200,000 | 18,531,000 | 50,740,000
Income before net gain on the sale of property | 7,423,000 | 4,381,000 | 11,785,000 | 8,531,000
Net gain/(loss) on sale of depreciable property | 180,856,000 | 44,658,000 | 261,381,000 | 44,699,000
Income from discontinued operations | 179,429,000 | 49,039,000 | 264,316,000 | 53,230,000
United Dominion Reality L.P. [Member] |  |  |  |
Discontinued Operations (Textual) [Abstract] |  |  |  |
Communities sold (in communities) | 4 | 4 | 4,000 | 4,000
Apartment homes sold (in apartment homes) | 1,314 | 984 | 1,314,000 | 984,000
Communities held for sale (in communities) | 0 |  | 0 |
Summary of income from discontinued operations |  |  |  |
Rental income | 3,377,000 | 7,749,000 | 6,750,000 | 19,447,000
Rental expenses | 1,178,000 | 3,005,000 | 2,247,000 | 7,288,000
Property management fee | 93,000 | 214,000 | 186,000 | 510,000
Other operating expenses | 0 | 43,000 | 0 | 111,000
Real estate depreciation | 0 | 2,708,000 | 1,205,000 | 6,998,000
Interest | 0 | 64,000 | 0 | 815,000
Total expenses | 1,271,000 | 6,034,000 | 3,638,000 | 15,722,000
Income before net gain on the sale of property | 2,106,000 | 1,715,000 | 3,112,000 | 3,725,000
Net gain/(loss) on sale of depreciable property | 51,266,000 | 16,038,000 | 51,182,000 | 16,038,000
Income from discontinued operations | $ 53,372,000 | $ 17,753,000 | $ 54,294,000 | $ 19,763,000

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- Definition Pretax gain (loss), not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 43 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph b -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph c -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 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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