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Capital Structure (UNITED DOMINION REALTY, L.P.) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011
Limited Partners' Capital Account [Line Items] |  |  |
General Partnership units outstanding | 174,865,430 | 174,749,068 |
Limited partnership units owned |  | 9,421,302 |
Percentage of units |  | 5.10% |
Redeemable non-controlling interests | $ 243,305 | 236,475 | [1]
United Dominion Reality L.P. [Member] |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
General Partnership units outstanding | 110,883 | 110,883 |
Limited partnership units owned | 184,170,370 | 184,170,370 |
UDR, Inc. [Member] |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Limited partnership units owned | 174,754,547 |  |
Percentage of units | 94.90% |  |
Non-affiliated Partners [Member] |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Limited partnership units owned | 9,415,823 |  |
Percentage of units | 5.10% |  |
Class A Limited Partner [Member] |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Limited partnership units owned | 1,751,671 | 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 | 1,751,671 | 1,751,671 |
[1] | See Note 9, "Noncontrolling Interests"

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