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Unsecured Debt (Details Textual) (USD $)
 3 Months Ended 3 Months Ended
Jun. 30, 2012
Jun. 30, 2012
4.63% Medium-Term Notes due January 2022 [Member]
Jan. 10, 2012
4.63% Medium-Term Notes due January 2022 [Member]
Jun. 30, 2012
2.68% Term Notes due December 2016 [Member]
Jun. 30, 2012
UDR Bank Credit Facility [Member]
Dec. 31, 2011
UDR Bank Credit Facility [Member]
Unsecured Debt (Textual) [Abstract]            
Total revolving credit facility $ 932,800,000       $ 900,000,000 $ 900,000,000
Initial Term of Credit Facilities 10 years       4 years  
Additional Time Period for Extending Facilities         1 year  
Increase in maximum borrowing capacity of unsecured revolving credit facility         1,350,000,000  
Credit facility interest rate         LIBOR plus a spread of 122.5 basis points and a facility fee of 22.5 basis points  
Basis spread on variable rate, LIBOR interest rate 1.225%          
Basis spread on variable rate, facility fee rate 0.23%          
Term Notes carried by the company     400,000,000 100,000,000    
Fixed interest rate   4.625% 4.625% 2.68%    
Percentage of price of medium-term notes issued     99.10%      
Interest rate     4.739%     1.50%
Interest rate at the end of the period       2.68%    
Line of Credit $ 4,100,000