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Fair Value of Derivatives and Financial Instruments (UNITED DOMINION REALTY, L.P.) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts $ 299 $ 0
Derivative Liability Designated as Hedging Instrument, Fair Value 2,382 4,965
Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 19,157  
Secured debt instruments - variable rate    
Total liabilities 3,742,913 3,651,141
Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts 299 [1]  
Derivative Liability Designated as Hedging Instrument, Fair Value 2,382 [1] 4,965 [1]
Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 451,582 [2] 466,375 [2]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 31,337 [2] 63,595 [2]
Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 94,700 [2] 94,700 [2]
Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 655,035 [2] 661,094 [2]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 211,409 [2] 211,409 [2]
Level 1 [Member] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 299  
Secured debt instruments - variable rate    
Total liabilities 2,382 4,965
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 18,858  
Secured debt instruments - variable rate    
Total liabilities 3,740,531 3,646,176
United Dominion Reality L.P. [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts 5 0
Derivative Liability Designated as Hedging Instrument, Fair Value 1,324 2,731
United Dominion Reality L.P. [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 5  
Secured debt instruments - variable rate    
Total liabilities 958,115 969,724
United Dominion Reality L.P. [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts 5 [3]  
Derivative Liability Designated as Hedging Instrument, Fair Value 1,324 [3] 2,731 [3]
United Dominion Reality L.P. [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 392,883 [4] 403,695 [4]
United Dominion Reality L.P. [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 394,849 [4] 394,239 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 142,059 [4] 142,059 [4]
United Dominion Reality L.P. [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 5  
Secured debt instruments - variable rate    
Total liabilities 1,324 2,731
United Dominion Reality L.P. [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [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 956,791 966,993
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets   83,833
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts 0  
Derivative Liability Designated as Hedging Instrument, Fair Value 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [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 2 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts 299  
Derivative Liability Designated as Hedging Instrument, Fair Value 2,382  
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets   83,833
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts 0  
Derivative Liability Designated as Hedging Instrument, Fair Value 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 451,582 466,375
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 31,337 63,595
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 655,035 661,094
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] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts 0  
Derivative Liability Designated as Hedging Instrument, Fair Value 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 1 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed 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] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts 5  
Derivative Liability Designated as Hedging Instrument, Fair Value 1,324 2,731
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 2 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed 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] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts 0  
Derivative Liability Designated as Hedging Instrument, Fair Value 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 3 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 392,883 403,695
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 3 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 394,849 394,239
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 142,059 142,059
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 18,617 83,033
Secured debt instruments - variable rate    
Total liabilities 3,630,574 3,528,668
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivative Liability Designated as Hedging Instrument, Fair Value 2,382 4,965
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 438,172 445,706
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 31,337 63,595
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 623,754 626,667
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] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 5  
Secured debt instruments - variable rate    
Total liabilities 929,598 937,596
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivative Liability Designated as Hedging Instrument, Fair Value 1,324 2,731
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 380,506 386,803
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 378,709 379,003
Secured debt instruments - variable rate    
Secured debt instruments - variable rate $ 142,059 $ 142,059
[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