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Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 3) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Offsetting Derivative Assets [Abstract]    
Derivative Asset Designated as Hedging Instrument, Fair Value $ 299 $ 0
Gross Amounts Offset in the Consolidated Balance Sheets 0 0
Net Amounts of Assets Presented in the Consolidated Balance Sheets (a) 299 [1] 0 [1]
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments (253) 0
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received 0 0
Net Amount 46 0
Offsetting Derivative Liabilities [Abstract]    
Derivative Liability Designated as Hedging Instrument, Fair Value 2,382 4,965
Gross Amounts Offset in the Consolidated Balance Sheets 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b) 2,382 [2] 4,965 [2]
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments (253) 0
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received 0 0
Net Amount 2,129 4,965
United Dominion Reality L.P. [Member]
    
Offsetting Derivative Assets [Abstract]    
Derivative Asset Designated as Hedging Instrument, Fair Value 5 0
Gross Amounts Offset in the Consolidated Balance Sheets 0 0
Net Amounts of Assets Presented in the Consolidated Balance Sheets (a) 5 [1] 0 [1]
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments 0 0
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received 0 0
Net Amount 5 0
Offsetting Derivative Liabilities [Abstract]    
Derivative Liability Designated as Hedging Instrument, Fair Value 1,324 2,731
Gross Amounts Offset in the Consolidated Balance Sheets 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b) 1,324 [2] 2,731 [2]
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments 0 0
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received 0 0
Net Amount $ 1,324 $ 2,731
[1] Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Balance Sheet” located in this footnote.
[2] Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Balance Sheet” located in this footnote