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Capital Structure (UNITED DOMINION REALTY, L.P.) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Limited Partners' Capital Account [Line Items] |  |
General Partnership units outstanding | 174,111,227 |
Redeemable noncontrolling interests in the Operating Partnership | $ 249,814 | $ 217,597
United Dominion Reality L.P. [Member] |  |
Limited Partners' Capital Account [Line Items] |  |
General Partnership units outstanding | 110,883 | 110,883
Limited partnership units owned | 183,167,815 | 183,167,815
Limited Partners' Capital Account, Required Period To Be Outstanding Before Unit is Redeemable | 1 year |
UDR, Inc. [Member] |  |
Limited Partners' Capital Account [Line Items] |  |
Limited partnership units owned | 174,000,344 | 173,848,891
Percentage of units | 95.00% | 94.90%
Non-affiliated Partners [Member] |  |
Limited Partners' Capital Account [Line Items] |  |
Limited partnership units owned | 9,167,471 | 9,318,924
Percentage of units | 5.00% | 5.10%
Class A Limited Partner [Member] |  |
Limited Partners' Capital Account [Line Items] |  |
Limited partnership units owned |  | 1,751,671
Cumulative, annual, non-compounded preferred return on Class A Partnership units | 8.00% |
Value of Class A Partnership units (in dollars per unit) | 16.61 |
Class A Limited Partner [Member] | United Dominion Reality L.P. [Member] |  |
Limited Partners' Capital Account [Line Items] |  |
Limited partnership units owned | 1,873,332 | 1,751,671
Class A Limited Partner [Member] | UDR, Inc. [Member] |  |
Limited Partners' Capital Account [Line Items] |  |
Limited partnership units owned | 121,661 |
Class A Limited Partner [Member] | Non-affiliated Partners [Member] |  |
Limited Partners' Capital Account [Line Items] |  |
Limited partnership units owned | 1,751,671 |

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