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Debt (UNITED DOMINION REALTY, L.P.) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Principal outstanding $ 1,442,361 $ 1,891,553
Weighted Average Interest Rate 4.35%  
Weighted Average Years to Maturity (in years) 5.6  
Number of Communities Encumbered (in communities) 43  
Fixed Rate Debt [Member]
    
Debt Instrument [Line Items]    
Principal outstanding 1,098,837 1,334,717
Weighted Average Interest Rate 5.20%  
Weighted Average Years to Maturity (in years) 5.2  
Number of Communities Encumbered (in communities) 32  
Fixed Rate Debt [Member] | Mortgage notes payable [Member]
    
Debt Instrument [Line Items]    
Principal outstanding 466,266 590,208
Weighted Average Interest Rate 5.31%  
Weighted Average Years to Maturity (in years) 3.8  
Number of Communities Encumbered (in communities) 9  
Fixed Rate Debt [Member] | Fannie Mae credit facilities [Member]
    
Debt Instrument [Line Items]    
Principal outstanding 632,571 744,509
Weighted Average Interest Rate 5.12%  
Weighted Average Years to Maturity (in years) 6.3  
Number of Communities Encumbered (in communities) 23  
Variable Rate Debt [Member]
    
Debt Instrument [Line Items]    
Principal outstanding 343,524 556,836
Weighted Average Interest Rate 1.63%  
Weighted Average Years to Maturity (in years) 6.6  
Number of Communities Encumbered (in communities) 11  
Variable Rate Debt [Member] | Mortgage notes payable [Member]
    
Debt Instrument [Line Items]    
Principal outstanding 37,415 151,685
Weighted Average Interest Rate 1.06%  
Weighted Average Years to Maturity (in years) 1.0  
Number of Communities Encumbered (in communities) 2  
Variable Rate Debt [Member] | Fannie Mae credit facilities [Member]
    
Debt Instrument [Line Items]    
Principal outstanding 211,409 310,451
Weighted Average Interest Rate 2.08%  
Weighted Average Years to Maturity (in years) 6.1  
Number of Communities Encumbered (in communities) 7  
Variable Rate Debt [Member] | Tax Exempt Notes Payable [Member]
    
Debt Instrument [Line Items]    
Principal outstanding 94,700 94,700
Weighted Average Interest Rate 0.85%  
Weighted Average Years to Maturity (in years) 10.1  
Number of Communities Encumbered (in communities) 2  
United Dominion Reality L.P. [Member]
    
Debt Instrument [Line Items]    
Principal outstanding 970,255 1,189,645
Weighted Average Interest Rate 4.47%  
Weighted Average Years to Maturity (in years) 5.6  
Number of Communities Encumbered (in communities) 23,000  
United Dominion Reality L.P. [Member] | Fannie Mae credit facilities [Member]
    
Debt Instrument [Line Items]    
Principal outstanding 508,000  
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member]
    
Debt Instrument [Line Items]    
Principal outstanding 768,653 902,622
Weighted Average Interest Rate 5.11%  
Weighted Average Years to Maturity (in years) 5.2  
Number of Communities Encumbered (in communities) 15,000  
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member] | Mortgage notes payable [Member]
    
Debt Instrument [Line Items]    
Principal outstanding 397,864 457,723
Weighted Average Interest Rate 5.31%  
Weighted Average Years to Maturity (in years) 4.0  
Number of Communities Encumbered (in communities) 5,000  
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member] | Fannie Mae credit facilities [Member]
    
Debt Instrument [Line Items]    
Principal outstanding 370,789 444,899
Weighted Average Interest Rate 4.90%  
Weighted Average Years to Maturity (in years) 6.7  
Number of Communities Encumbered (in communities) 10,000  
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member]
    
Debt Instrument [Line Items]    
Principal outstanding 201,602 287,023
Weighted Average Interest Rate 2.03%  
Weighted Average Years to Maturity (in years) 7.3  
Number of Communities Encumbered (in communities) 8,000  
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] | Mortgage notes payable [Member]
    
Debt Instrument [Line Items]    
Principal outstanding 37,415 37,415
Weighted Average Interest Rate 1.06%  
Weighted Average Years to Maturity (in years) 1.0  
Number of Communities Encumbered (in communities) 2,000  
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] | Fannie Mae credit facilities [Member]
    
Debt Instrument [Line Items]    
Principal outstanding 137,187 222,608
Weighted Average Interest Rate 2.55%  
Weighted Average Years to Maturity (in years) 6.6  
Number of Communities Encumbered (in communities) 5,000  
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] | Tax Exempt Notes Payable [Member]
    
Debt Instrument [Line Items]    
Principal outstanding $ 27,000 $ 27,000
Weighted Average Interest Rate 0.71%  
Weighted Average Years to Maturity (in years) 17.7  
Number of Communities Encumbered (in communities) 1,000