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Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Designated as Hedging Instrument [Member]
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Mar. 31, 2013
Interest Rate Products [Member]
Other Assets [Member]
Designated as Hedging Instrument [Member]
Mar. 31, 2012
Interest Rate Products [Member]
Other Assets [Member]
Designated as Hedging Instrument [Member]
Mar. 31, 2013
Interest Rate Products [Member]
Other Assets [Member]
Not Designated as Hedging Instrument [Member]
Mar. 31, 2012
Interest Rate Products [Member]
Other Assets [Member]
Not Designated as Hedging Instrument [Member]
Mar. 31, 2013
Interest Rate Products [Member]
Other Liabilities [Member]
Designated as Hedging Instrument [Member]
Mar. 31, 2012
Interest Rate Products [Member]
Other Liabilities [Member]
Designated as Hedging Instrument [Member]
Mar. 31, 2013
Interest Rate Products [Member]
Other Liabilities [Member]
Not Designated as Hedging Instrument [Member]
Mar. 31, 2012
Interest Rate Products [Member]
Other Liabilities [Member]
Not Designated as Hedging Instrument [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Designated as Hedging Instrument [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Not Designated as Hedging Instrument [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Interest Rate Products [Member]
Other Assets [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Interest Rate Products [Member]
Other Assets [Member]
Designated as Hedging Instrument [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Interest Rate Products [Member]
Other Assets [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Interest Rate Products [Member]
Other Assets [Member]
Not Designated as Hedging Instrument [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Interest Rate Products [Member]
Other Liabilities [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Interest Rate Products [Member]
Other Liabilities [Member]
Designated as Hedging Instrument [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Interest Rate Products [Member]
Other Liabilities [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Interest Rate Products [Member]
Other Liabilities [Member]
Not Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]                                                
Derivative Asset Designated as Hedging Instrument, Fair Value $ 0 $ 2     $ 0 $ 2             $ 0 $ 2     $ 0 $ 2            
Derivative Asset Not Designated as Hedging Instrument, Fair Value     0 0     0 0             0 0     0 0        
Derivative Liability Designated as Hedging Instrument, Fair Value 9,224 11,022             9,224 11,022     3,977 4,750             3,977 4,750    
Derivative Liability Not Designated as Hedging Instrument, Fair Value     $ 0 $ 0             $ 0 $ 0     $ 0 $ 0             $ 0 $ 0