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Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Apartment_Homes
Communities
States
Mar. 31, 2012
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Communities
States
Apartment_Homes
Mar. 31, 2012
United Dominion Reality L.P. [Member]
Mar. 31, 2013
New York Properties [Member]
Dec. 31, 2012
New York Properties [Member]
Apartment_Homes
Communities
Oct. 31, 2012
New York Properties [Member]
United Dominion Reality L.P. [Member]
Mar. 31, 2013
New York Properties [Member]
United Dominion Reality L.P. [Member]
Dec. 31, 2012
New York Properties [Member]
United Dominion Reality L.P. [Member]
Apartment_Homes
Communities
Real Estate Owned (Textual) [Abstract]                  
Number of communities owned (in communities) 143   70            
Number of states operating within (in states) 10   9            
Number of apartments owned (in apartments homes) 41,750   21,660            
Number of communities acquired apartment homes are within 0                
Number of apartment homes acquired 0                
Development costs excluding direct costs and capitlized interest $ 3,000,000 $ 2,700,000 $ 673,000 $ 539,000          
Interest capitalized during period 8,400,000 4,900,000 1,300,000 639,000          
Number of Communities Owned           3     2
Number of Apartments Owned           1,706     1,001
Impairment of Long-Lived Assets Held-for-use         0 9,000,000 7,100,000 0  
Other Cost and Expense, Operating $ 1,643,000 $ 1,383,000 $ 1,386,000 $ 4,049,000   $ 10,400,000     $ 7,000,000