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Debt (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Total revolving credit facility $ 932,800,000 $ 932,800,000  
Borrowings outstanding 800,000,000 800,000,000  
Initial term of credit facilities (in years) 10 years    
Secured debt including debt on real estate held for sale 1,442,361,000 1,442,361,000 1,891,553,000
Weighted average interest rate   4.35%  
Unamortized fair market adjustment 19,500,000 19,500,000 24,100,000
UDR Bank Credit Facility [Member]
      
Debt Instrument [Line Items]      
Total revolving credit facility 900,000,000 900,000,000 900,000,000
Borrowings outstanding 0 [1] 0 [1] 421,000,000 [1]
Initial term of credit facilities (in years) 4 years    
Fixed Rate Debt [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 1,098,837,000 1,098,837,000 1,334,717,000
Weighted average interest rate   5.20%  
Variable Rate Debt [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 343,524,000 343,524,000 556,836,000
Weighted average interest rate   1.63%  
Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 632,571,000 632,571,000 744,509,000
Weighted average interest rate   5.12%  
Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 211,409,000 211,409,000 310,451,000
Weighted average interest rate   2.08%  
Mortgage notes payable [Member] | Fixed Rate Debt [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 466,266,000 466,266,000 590,208,000
Weighted average interest rate   5.31%  
Notes payable minimum interest rates range 3.43%    
Notes payable maximum interest rates range 6.54%    
Mortgage notes payable [Member] | Variable Rate Debt [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 37,415,000 37,415,000 151,685,000
Weighted average interest rate   1.06%  
Notes payable minimum interest rates range 1.06%    
Tax Exempt Notes Payable [Member] | Variable Rate Debt [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 94,700,000 94,700,000 94,700,000
Weighted average interest rate   0.85%  
Unsecured Revolving Credit Facility due October 2015 [Member]
      
Debt Instrument [Line Items]      
Borrowings outstanding 0 [2],[3] 0 [2],[3] 421,000,000 [2],[3]
4.25% Medium-Term Notes due June 2018 [Member]
      
Debt Instrument [Line Items]      
Unamortized fair market adjustment 2,536,000 2,536,000 2,751,000
4.63% Medium-Term Notes due January 2022 [Member]
      
Debt Instrument [Line Items]      
Unamortized fair market adjustment 3,420,000 3,420,000  
United Dominion Reality L.P. [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 970,255,000 970,255,000 1,189,645,000
Weighted average interest rate   4.47%  
Unamortized fair market adjustment 15,700,000 15,700,000 17,800,000
United Dominion Reality L.P. [Member] | UDR Bank Credit Facility [Member] | Financial Guarantee [Member]
      
Debt Instrument [Line Items]      
Guarantor borrowing capacity 900,000,000 900,000,000  
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 768,653,000 768,653,000 902,622,000
Weighted average interest rate   5.11%  
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 201,602,000 201,602,000 287,023,000
Weighted average interest rate   2.03%  
United Dominion Reality L.P. [Member] | Fannie Mae credit facilities [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 508,000,000 508,000,000  
United Dominion Reality L.P. [Member] | Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 370,789,000 370,789,000 444,899,000
Weighted average interest rate   4.90%  
United Dominion Reality L.P. [Member] | Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 137,187,000 137,187,000 222,608,000
Weighted average interest rate   2.55%  
United Dominion Reality L.P. [Member] | Mortgage notes payable [Member] | Fixed Rate Debt [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 397,864,000 397,864,000 457,723,000
Weighted average interest rate   5.31%  
Notes payable minimum interest rates range 3.43%    
Notes payable maximum interest rates range 5.94%    
United Dominion Reality L.P. [Member] | Mortgage notes payable [Member] | Variable Rate Debt [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 37,415,000 37,415,000 37,415,000
Weighted average interest rate   1.06%  
United Dominion Reality L.P. [Member] | Tax Exempt Notes Payable [Member] | Variable Rate Debt [Member]
      
Debt Instrument [Line Items]      
Secured debt including debt on real estate held for sale 27,000,000 27,000,000 27,000,000
Weighted average interest rate   0.71%  
United Dominion Reality L.P. [Member] | 2.90% Term Notes due January 2016 [Member] | Financial Guarantee [Member]
      
Debt Instrument [Line Items]      
Guarantor borrowing capacity 250,000,000 250,000,000  
United Dominion Reality L.P. [Member] | 1.68% Term Notes due December 2016 [Member] | Financial Guarantee [Member]
      
Debt Instrument [Line Items]      
Guarantor borrowing capacity 100,000,000 100,000,000  
United Dominion Reality L.P. [Member] | 4.25% Medium-Term Notes due June 2018 [Member] | Financial Guarantee [Member]
      
Debt Instrument [Line Items]      
Guarantor borrowing capacity 300,000,000 300,000,000  
United Dominion Reality L.P. [Member] | 4.63% Medium-Term Notes due January 2022 [Member] | Financial Guarantee [Member]
      
Debt Instrument [Line Items]      
Guarantor borrowing capacity $ 400,000,000 $ 400,000,000  
[1] Excludes $4.1 million of letters of credit at June 30, 2012.
[2] The Company has a $900 million unsecured revolving credit facility. The unsecured credit facility has an initial term of four years and includes a one-year extension option. It contains an accordion feature that allows the Company to increase the facility to $1.35 billion. The credit facility carries an interest rate equal to LIBOR plus a spread of 122.5 basis points and a facility fee of 22.5 basis points.
[3] The Operating Partnership is a guarantor at June 30, 2012 and December 31, 2011.