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Consolidated Balance Sheets (UNITED DOMINION REALTY, L.P) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Real estate owned: |  |
Real estate held for sale, accumulated depreciation | $ 0 | $ 226,067
Partners' Capital: |  |
OP units outstanding related to general partner | 174,865,430 | 174,749,068
OP units outstanding related to limited partner |  | 9,421,302
United Dominion Reality L.P. [Member] |  |
Real estate owned: |  |
Real estate held for sale, accumulated depreciation | $ 0 | $ 52,887
Partners' Capital: |  |
OP units outstanding related to operating partnership | 184,281,253 | 184,281,253
OP units outstanding related to general partner | 110,883 | 110,883
OP units outstanding related to limited partner | 184,170,370 | 184,170,370

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