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Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 Apartment_Homes Communities States | Sep. 30, 2013 Communities Apartment_Homes | Sep. 30, 2014 Communities States Apartment_Homes | Sep. 30, 2013 Apartment_Homes | Dec. 31, 2013 | Dec. 31, 2012 Communities
Real Estate Owned (Textual) [Abstract] |  |  |  |  |  |
Number of communities owned (in communities) | 141 |  | 141 |  |  |
Number of states operating within (in states) | 10 |  | 10 |  |  |
Number of apartments owned (in apartments homes) | 40,477 |  | 40,477 |  |  |
Number of communities acquired apartment homes are within | 0 | 0 | 0 |  |  | 0
Number of Apartment Homes Acquired | 0 | 0 |  | 0 |  |
Development costs excluding direct costs and capitlized interest | 1,720,000 | $ 2,400,000 | $ 7,230,000 | $ 8,500,000 |  |
Interest capitalized during period | 5,200,000 | 6,600,000 | 15,400,000 | 23,200,000 |  |
Other Cost and Expense, Operating | 2,009,000 | 1,775,000 | 6,097,000 | 5,211,000 |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  | 237,700,000 |  |  |
Gains/(loss) on sales of real estate, net of tax | 31,302,000 | 0 | 82,305,000 | 0 |  |
Communities Sold |  |  | 6 | 0 | 2 |
Casualty (Recoveries)/Charges | 0 | 6,460,000 | (500,000) | 12,253,000 |  | (12,253,000)
Gain (Loss) on Disposition of Property Plant Equipment | 100,000 |  | 82,400,000 |  |  |
Payments for (Proceeds from) Investments |  |  | 233,913,000 | 140,834,000 |  |
United Dominion Reality L.P. [Member] |  |  |  |  |  |
Real Estate Owned (Textual) [Abstract] |  |  |  |  |  |
Number of communities owned (in communities) | 67 |  | 67 |  |  |
Number of states operating within (in states) | 9 |  | 9 |  |  |
Number of apartments owned (in apartments homes) | 20,753 |  | 20,753 |  |  |
Development costs excluding direct costs and capitlized interest | 496,000 | 618,000 | 1,793,000 | 2,000,000 |  |
Interest capitalized during period | 800,000 | 1,700,000 | 2,800,000 | 4,400,000 |  |
Other Cost and Expense, Operating | 1,484,000 | 1,405,000 | 4,371,000 | 4,215,000 |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  | 48,700,000 |  |  |
Gains/(loss) on sales of real estate, net of tax | 0 | 0 | 40,687,000 | 0 |  |
Communities Sold |  |  | 1 | 0 | 2 |
Casualty-related (recoveries)/charges, net | 0 | (3,807,000) |  |  |  |
Casualty (Recoveries)/Charges | 0 | 3,807,000 | (500,000) | 8,083,000 |  | (8,083,000)
Gain (Loss) on Disposition of Property Plant Equipment |  |  | 24,400,000 |  |  |
Payments for (Proceeds from) Investments |  |  | 47,922,000 | 0 |  |
New York Properties [Member] |  |  |  |  |  |
Real Estate Owned (Textual) [Abstract] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | 0 |  |  |  |  |
New York Properties [Member] | United Dominion Reality L.P. [Member] |  |  |  |  |  |
Real Estate Owned (Textual) [Abstract] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | $ 0 |  |  |  |  |

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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