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Real Estate Owned (Details Textual) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Apartment_Homes
Communities
States
Mar. 31, 2012
Mar. 31, 2013
New York Properties [Member]
Dec. 31, 2012
New York Properties [Member]
Apartment_Homes
Communities
Dec. 31, 2012
Hurricane Sandy [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
States
Communities
Apartment_Homes
Mar. 31, 2012
United Dominion Reality L.P. [Member]
Oct. 31, 2012
United Dominion Reality L.P. [Member]
New York Properties [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
New York Properties [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
New York Properties [Member]
Communities
Apartment_Homes
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Hurricane Sandy [Member]
Real Estate Owned (Textual) [Abstract]                      
Number of owned and consolidated community by the Company 143         70          
Number of states in which there are owned and consolidated communities 10         9          
Number of apartment homes owned and consolidated by the Company 41,750         21,660          
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   10,400,000   1,386,000 4,049,000     7,000,000  
Total Estimated Insurance Recovery         $ 14,500,000           $ 10,800,000