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Discontinued Operations (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 12 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 Operating Community [Member] | Sep. 30, 2014 Operating Community [Member] | Mar. 31, 2014 Land [Member] | Sep. 30, 2014 Land [Member] | 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 United Dominion Reality L.P. [Member] Operating Community [Member]
Disposal Group, Including Discontinued Operation, Operating Income (Loss) | $ 6,000 | $ 884,000 | $ (103,000) | $ 2,567,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax | 75,000 | 0 | 75,000 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment | 100,000 |  | 82,400,000 |  |  |  | 31,300,000 | 81,200,000 | 1,100,000 | 1,100,000 |  |  | 24,400,000 |  |  |  | 39,600,000
Discontinued Operations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Communities sold (in communities) |  |  | 6 | 0 | 2 |  |  | 1 |  |  |  |  | 1 | 0 | 0 | 2 |
Apartment Homes Sold |  |  | 1,904 |  | 914 |  |  |  |  |  |  |  |  |  |  | 914 |
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 |  |
Other operating expenses | 3,000 | 12,000 | 21,000 | 26,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit/(expense) | (2,000) | 0 | 38,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Income/(loss) from discontinued operations, net of tax | 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 common stockholders | $ 73,000 | $ 852,000 | $ 6,000 | $ 2,475,000 |  |  |  |  |  |  | $ 0 | $ 978,000 | $ 0 |  | $ 2,766,000 |  |

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