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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
Jun. 30, 2012
Dec. 31, 2011
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets $ 45,436 $ 89
Secured debt instruments - variable rate    
Total liabilities 3,568,367 4,104,800
Interest Rate Contracts [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts 17 89 [1]
Derivatives - Interest rate contracts 13,404 13,660 [1]
Mortgage notes payable [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 509,387 635,531 [2]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 37,415 151,685 [2]
Tax Exempt Notes Payable [Member]
    
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 94,700 94,700 [2]
Credit Facilities [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 690,817 799,584 [2]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 211,409 310,451 [2]
Level 1 [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 0 0
Secured debt instruments - variable rate    
Total liabilities 0 0
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 0 [1]
Derivatives - Interest rate contracts 0 0 [1]
Level 1 [Member] | Mortgage notes payable [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 0 [2]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0 [2]
Level 1 [Member] | Tax Exempt Notes Payable [Member]
    
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0 [2]
Level 1 [Member] | Credit Facilities [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 0 [2]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0 [2]
Level 2 [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 17 89
Secured debt instruments - variable rate    
Total liabilities 13,404 13,660
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 17 89 [1]
Derivatives - Interest rate contracts 13,404 13,660 [1]
Level 2 [Member] | Mortgage notes payable [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 0 [2]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0 [2]
Level 2 [Member] | Tax Exempt Notes Payable [Member]
    
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0 [2]
Level 2 [Member] | Credit Facilities [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 0 [2]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0 [2]
Level 3 [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 45,419 0
Secured debt instruments - variable rate    
Total liabilities 3,554,963 4,091,140
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 0 [1]
Derivatives - Interest rate contracts 0 0 [1]
Level 3 [Member] | Mortgage notes payable [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 509,387 635,531 [2]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 37,415 151,685 [2]
Level 3 [Member] | Tax Exempt Notes Payable [Member]
    
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 94,700 94,700 [2]
Level 3 [Member] | Credit Facilities [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 690,817 799,584 [2]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 211,409 310,451 [2]
United Dominion Reality L.P. [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 12 71
Secured debt instruments - variable rate    
Total liabilities 1,041,704 1,251,263
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 12 [3] 71 [3]
Derivatives - Interest rate contracts 5,898 [3] 6,207 [3]
United Dominion Reality L.P. [Member] | Mortgage notes payable [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 436,095 [4] 495,412 [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] | Credit Facilities [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 398,109 [4] 462,621 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 137,187 [4] 222,608 [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 0
Secured debt instruments - variable rate    
Total liabilities 0 0
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 [3] 0 [3]
Derivatives - Interest rate contracts 0 [3] 0 [3]
United Dominion Reality L.P. [Member] | Level 1 [Member] | Mortgage notes payable [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 [4] 0 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 [4] 0 [4]
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 [4] 0 [4]
United Dominion Reality L.P. [Member] | Level 1 [Member] | Credit Facilities [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 [4] 0 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 [4] 0 [4]
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 12 71
Secured debt instruments - variable rate    
Total liabilities 5,898 6,207
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 12 [3] 71 [3]
Derivatives - Interest rate contracts 5,898 [3] 6,207 [3]
United Dominion Reality L.P. [Member] | Level 2 [Member] | Mortgage notes payable [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 [4] 0 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 [4] 0 [4]
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 [4] 0 [4]
United Dominion Reality L.P. [Member] | Level 2 [Member] | Credit Facilities [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 [4] 0 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 [4] 0 [4]
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 0
Secured debt instruments - variable rate    
Total liabilities 1,035,806 1,245,056
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 [3] 0 [3]
Derivatives - Interest rate contracts 0 [3] 0 [3]
United Dominion Reality L.P. [Member] | Level 3 [Member] | Mortgage notes payable [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 436,095 [4] 495,412 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 37,415 [4] 37,415 [4]
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 [4] 27,000 [4]
United Dominion Reality L.P. [Member] | Level 3 [Member] | Credit Facilities [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 398,109 [4] 462,621 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate $ 137,187 [4] $ 222,608 [4]
[1] See Note 11, “Derivatives and Hedging Activity”
[2] See Note 6, “Secured Debt”
[3] See Note 8, Derivatives and Hedging Activity
[4] See Note 5, Debt