Consolidated Balance Sheets (UNITED DOMINION REALTY, L.P) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Real Estate Under Development Accumulated Depreciation	$ 1,246	$ 1,253
Partners' Capital:
OP units outstanding related to general partner	174,957,876
United Dominion Reality L.P. [Member]
Real Estate Under Development Accumulated Depreciation	$ 1,132	$ 1,132
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