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Hurricane Related (Recoveries)/Charges (UNITED DOMINION REALTY, L.P.) (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 4 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
New York Properties [Member]
Dec. 31, 2012
New York Properties [Member]
Communities
Apartment_Homes
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Mar. 31, 2012
United Dominion Reality L.P. [Member]
Dec. 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
Rent Concessions [Member]
Dec. 31, 2012
Rent Concessions [Member]
United Dominion Reality L.P. [Member]
Dec. 31, 2012
Rent not contractually receivable [Member]
Dec. 31, 2012
Rent not contractually receivable [Member]
United Dominion Reality L.P. [Member]
Dec. 31, 2012
Hurricane Sandy [Member]
Dec. 31, 2012
Hurricane Sandy [Member]
United Dominion Reality L.P. [Member]
Mar. 31, 2013
Impairment and Repair and Cleanup Costs [Member]
Hurricane Sandy [Member]
Apr. 30, 2013
Impairment and Repair and Cleanup Costs [Member]
Hurricane Sandy [Member]
Mar. 31, 2013
Impairment and Repair and Cleanup Costs [Member]
Hurricane Sandy [Member]
United Dominion Reality L.P. [Member]
Apr. 30, 2013
Impairment and Repair and Cleanup Costs [Member]
Hurricane Sandy [Member]
United Dominion Reality L.P. [Member]
Mar. 31, 2013
Business Interruption [Member]
Hurricane Sandy [Member]
Apr. 30, 2013
Business Interruption [Member]
Hurricane Sandy [Member]
Apr. 30, 2013
Business Interruption [Member]
Hurricane Sandy [Member]
United Dominion Reality L.P. [Member]
Apr. 30, 2013
FY 2012 [Member]
Business Interruption [Member]
Hurricane Sandy [Member]
Apr. 30, 2013
FY 2012 [Member]
Business Interruption [Member]
Hurricane Sandy [Member]
United Dominion Reality L.P. [Member]
Apr. 30, 2013
FY 2013 [Member]
Business Interruption [Member]
Hurricane Sandy [Member]
Apr. 30, 2013
FY 2013 [Member]
Business Interruption [Member]
Hurricane Sandy [Member]
United Dominion Reality L.P. [Member]
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                                  
Business Interruption Costs     4,400,000         2,200,000       3,600,000 1,800,000 800,000 400,000                          
Total Estimated Insurance Recovery                               14,500,000 10,800,000                      
Proceeds from Insurance Settlement, Operating Activities                                   8,400,000   6,000,000   2,500,000 3,000,000 2,000,000 2,800,000 1,800,000 187,000 200,000
Estimated Insurance Recoveries                                     $ 4,600,000   $ 3,200,000   $ 548,000 $ 500,000