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Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 Communities States Apartment_Homes | Jun. 30, 2011 Apartment_Homes Communities | Jun. 30, 2012 Communities States Apartment_Homes | Jun. 30, 2011 Communities Apartment_Homes
Real Estate Owned (Textual) [Abstract] |  |  |  |
Number of communities owned (in communities) | 145 |  | 145 |
Number of states operating within (in states) | 10 |  | 10 |
Number of apartments owned (in apartments homes) | 41,681 |  | 41,681 |
Number of Communities Acquired Apartment Homes Are Within |  | 3 |  | 3
Number of Apartment Homes Acquired |  | 1,326 |  | 1,326
Development costs excluding direct costs and capitlized interest | $ 2,000 | $ 1,800 | $ 4,700 | $ 5,900
Interest capitalized during period | 5,100 | 3,500 | 10,000 | 6,100
United Dominion Reality L.P. [Member] |  |  |  |
Real Estate Owned (Textual) [Abstract] |  |  |  |
Number of communities owned (in communities) | 73 |  | 73 |
Number of apartments owned (in apartments homes) | 21,846 |  | 21,846 |
Development costs excluding direct costs and capitlized interest | 344 | 324 | 883 | 1,400
Interest capitalized during period | $ 680 | $ 503 | $ 1,319 | $ 911

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- Definition Number Of States In Which There Are Owned And Consolidated Communities + References No definition available. + Details
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- Definition Total interest costs incurred during the period that are capitalized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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