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Consolidated Balance Sheets (UNITED DOMINION REALTY, L.P) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Real estate under development accumulated depreciation	$ 513	$ 1,411
Partners' Capital:
OP units outstanding related to general partner	174,111,227
United Dominion Reality L.P. [Member]
Real estate under development accumulated depreciation	$ 0	$ 0
Partners' Capital:
OP units outstanding related to general partner	110,883	110,883
OP units outstanding related to limited partner	183,167,815	183,167,815

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