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Fair Value of Derivatives and Financial Instruments (UNITED DOMINION REALTY, L.P.) (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Total assets $ 67,172    
Secured debt instruments - variable rate      
Total liabilities 3,742,646   3,654,305
Interest Rate Contracts [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Derivatives - Interest rate contracts 9,224 [1]   11,022 [1]
Mortgages Notes Payable [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 487,297 [2]   494,728 [2]
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 37,415 [2]   37,415 [2]
Tax Exempt Notes Payable [Member]
      
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 94,700 [2]   94,700 [2]
Line of Credit [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 681,792 [2]   689,295 [2]
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 211,409 [2]   211,409 [2]
Level 1 [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Total assets 0    
Secured debt instruments - variable rate      
Total liabilities 0   0
Level 2 [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Total assets 0    
Secured debt instruments - variable rate      
Total liabilities 9,224   11,022
Level 3 [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Total assets 67,172    
Secured debt instruments - variable rate      
Total liabilities 3,733,422   3,643,283
United Dominion Reality L.P. [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Total assets   2  
Secured debt instruments - variable rate      
Total liabilities 1,024,436 1,035,714  
United Dominion Reality L.P. [Member] | Interest Rate Contracts [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Derivatives - Interest rate contracts   2 [3]  
Derivatives - Interest rate contracts 3,977 [3] 4,750 [3]  
United Dominion Reality L.P. [Member] | Mortgages Notes Payable [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 423,373 [4] 429,973 [4]  
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 37,415 [4] 37,415 [4]  
United Dominion Reality L.P. [Member] | Tax Exempt Notes Payable [Member]
      
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 27,000 [4] 27,000 [4]  
United Dominion Reality L.P. [Member] | Line of Credit [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 395,484 [4] 399,389 [4]  
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 137,187 [4] 137,187 [4]  
United Dominion Reality L.P. [Member] | Level 1 [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Total assets   0  
Secured debt instruments - variable rate      
Total liabilities 0 0  
United Dominion Reality L.P. [Member] | Level 2 [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Total assets   2  
Secured debt instruments - variable rate      
Total liabilities 3,977 4,750  
United Dominion Reality L.P. [Member] | Level 3 [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Total assets   0  
Secured debt instruments - variable rate      
Total liabilities 1,020,459 1,030,964  
Estimate of Fair Value, Fair Value Disclosure [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Total assets   64,932  
Estimate of Fair Value, Fair Value Disclosure [Member] | Interest Rate Contracts [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Derivatives - Interest rate contracts   2  
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Total assets   0  
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Interest Rate Contracts [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Derivatives - Interest rate contracts   0  
Derivatives - Interest rate contracts 0   0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Mortgages Notes Payable [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 0   0
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 0   0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Tax Exempt Notes Payable [Member]
      
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 0   0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Line of Credit [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 0   0
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 0   0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Total assets   2  
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Interest Rate Contracts [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Derivatives - Interest rate contracts   2  
Derivatives - Interest rate contracts 9,224    
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Mortgages Notes Payable [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 0   0
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 0   0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Tax Exempt Notes Payable [Member]
      
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 0   0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Line of Credit [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 0   0
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 0   0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Total assets   64,930  
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Interest Rate Contracts [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Derivatives - Interest rate contracts   0  
Derivatives - Interest rate contracts 0   0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Mortgages Notes Payable [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 487,297   494,728
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 37,415   37,415
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Tax Exempt Notes Payable [Member]
      
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 94,700   94,700
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Line of Credit [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 681,792   689,295
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 211,409   211,409
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 1 [Member] | Interest Rate Contracts [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Derivatives - Interest rate contracts   0  
Derivatives - Interest rate contracts 0 0  
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 1 [Member] | Mortgages Notes Payable [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 0 0  
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 0 0  
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 1 [Member] | Tax Exempt Notes Payable [Member]
      
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 0 0  
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 1 [Member] | Line of Credit [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 0 0  
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 0 0  
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 2 [Member] | Interest Rate Contracts [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Derivatives - Interest rate contracts   2  
Derivatives - Interest rate contracts 3,977 4,750  
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 2 [Member] | Mortgages Notes Payable [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 0 0  
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 0 0  
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 2 [Member] | Tax Exempt Notes Payable [Member]
      
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 0 0  
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 2 [Member] | Line of Credit [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 0 0  
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 0 0  
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 3 [Member] | Interest Rate Contracts [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Derivatives - Interest rate contracts   0  
Derivatives - Interest rate contracts 0 0  
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 3 [Member] | Mortgages Notes Payable [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 423,373 429,973  
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 37,415 37,415  
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 3 [Member] | Tax Exempt Notes Payable [Member]
      
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 27,000 27,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 3 [Member] | Line of Credit [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 395,484 399,389  
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 137,187 137,187  
Carrying (Reported) Amount, Fair Value Disclosure [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Total assets 66,193 64,008  
Secured debt instruments - variable rate      
Total liabilities 3,508,331 3,420,355  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Interest Rate Contracts [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Derivatives - Interest rate contracts   2  
Derivatives - Interest rate contracts 9,224 11,022  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mortgages Notes Payable [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 453,076 455,533  
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 37,415 37,415  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Tax Exempt Notes Payable [Member]
      
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 94,700 94,700  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Line of Credit [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 629,063 631,078  
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 211,409 211,409  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Total assets   2  
Secured debt instruments - variable rate      
Total liabilities 968,966 971,989  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Interest Rate Contracts [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Derivatives - Interest rate contracts   2  
Derivatives - Interest rate contracts 3,977 4,750  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Mortgages Notes Payable [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 392,953 394,999  
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 37,415 37,415  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Tax Exempt Notes Payable [Member]
      
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 27,000 27,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Line of Credit [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 370,434 370,638  
Secured debt instruments - variable rate      
Secured debt instruments - variable rate $ 137,187 $ 137,187  
[1] See Note 6, Secured and Unsecured Debt
[2] See Note 2, Significant Accounting Policies
[3] See Note 5, Debt
[4] See Note 8, Derivatives and Hedging Activity