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Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Entity Information [Line Items]          
Cash flow hedge ineffectiveness in earnings materiality 0 3 0 3  
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense $ 2,600,000   $ 2,600,000    
Losses in the fair value of derivatives not designated in hedging relationships 22,000 $ 0 24,000 $ 0  
Payment required to pay for contract termination 10,700,000   10,700,000    
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 0 0 0 0  
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense $ 440,000   $ 440,000    
Losses in the fair value of derivatives not designated in hedging relationships 22,000 $ 0 0    
Fair value of derivatives in a net liability position 436,000   436,000    
Derivative, Collateral, Obligation to Return Cash $ 0   $ 0   $ 0