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Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 1) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Interest Rate Products [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member] |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Asset Designated as Hedging Instrument, Fair Value | $ 9 | $ 86
Interest Rate Products [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Asset Not Designated as Hedging Instrument, Fair Value | 3 | 2
Interest Rate Products [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member] |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 9,109 | 10,368
Interest Rate Products [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Liability Not Designated as Hedging Instrument, Fair Value | 0 | 0
United Dominion Reality L.P. [Member] |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Asset Designated as Hedging Instrument, Fair Value | 7 | 39
Derivative Liability Designated as Hedging Instrument, Fair Value | 436 | 918
United Dominion Reality L.P. [Member] | Interest Rate Products [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member] |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Asset Designated as Hedging Instrument, Fair Value | 4 | 37
United Dominion Reality L.P. [Member] | Interest Rate Products [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Asset Not Designated as Hedging Instrument, Fair Value | 3 | 2
United Dominion Reality L.P. [Member] | Interest Rate Products [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member] |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 436 | 918
United Dominion Reality L.P. [Member] | Interest Rate Products [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Liability Not Designated as Hedging Instrument, Fair Value | $ 0 | $ 0

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