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Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
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 $ 6,200,000    
Losses in the fair value of derivatives not designated in hedging relationships 2,000 (298,000)  
Fair value of derivatives in a net liability position 9,900,000    
Payment required to pay for contract termination 9,900,000    
Derivative, Collateral, Obligation to Return Cash 0   0
Maximum [Member]
      
Entity Information [Line Items]      
Cash flow hedge ineffectiveness in earnings 1,000 1,000  
United Dominion Reality L.P. [Member]
      
Entity Information [Line Items]      
Cash flow hedge ineffectiveness in earnings materiality less than a $1,000 loss    
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense 2,300,000    
Losses in the fair value of derivatives not designated in hedging relationships 2,000 2,000  
Fair value of derivatives in a net liability position 4,300,000    
Payment required to pay for contract termination 4,300,000    
Derivative, Collateral, Obligation to Return Cash $ 0   $ 0