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Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2013
Entity Information [Line Items]          
Cash flow hedge ineffectiveness in earnings materiality less than a  $1,000        
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense         $ 7,000,000
Losses in the fair value of derivatives not designated in hedging relationships 7,000 (86,000) (291,000) (36,000)  
Fair value of derivatives in a net liability position 14,100,000   14,100,000    
Payment required to pay for contract termination 14,100,000   14,100,000    
Maximum [Member]
          
Entity Information [Line Items]          
Cash flow hedge ineffectiveness in earnings   1,000 1,000 1,000  
United Dominion Reality L.P. [Member]
          
Entity Information [Line Items]          
Cash flow hedge ineffectiveness in earnings materiality less than $1,000        
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense         3,000,000
Losses in the fair value of derivatives not designated in hedging relationships 5,000 94,000 7,000 116,000  
Fair value of derivatives in a net liability position 6,800,000   6,800,000    
Payment required to pay for contract termination $ 6,800,000   $ 6,800,000