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Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2013
Entity Information [Line Items]            
Cash flow hedge ineffectiveness in earnings materiality $3,000 less than a  $1,000 3000 less than $1,000    
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense $ 4,400,000   $ 4,400,000      
Losses in the fair value of derivatives not designated in hedging relationships 0 (280,000) 0   (275,000)  
Fair value of derivatives in a net liability position 2,400,000   2,400,000      
Payment required to pay for contract termination 2,400,000   2,400,000      
Derivative, Collateral, Obligation to Return Cash 0   0     0
United Dominion Reality L.P. [Member]
            
Entity Information [Line Items]            
Cash flow hedge ineffectiveness in earnings materiality less than a $1,000 loss less than a $1,000 loss 0 less than $1,000 less than a $1,000 loss  
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense 1,300,000   1,300,000      
Losses in the fair value of derivatives not designated in hedging relationships 0 0 0 5,000 5,000  
Fair value of derivatives in a net liability position 1,500,000   1,500,000      
Payment required to pay for contract termination 1,500,000   1,500,000      
Derivative, Collateral, Obligation to Return Cash $ 0   $ 0     $ 0