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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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