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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