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Consolidation and Basis of Presentation (Details) | Jun. 30, 2012 | Dec. 31, 2011
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Consolidation And Basis Of Presentation (Textual) [Abstract] |  |
Operating Partnership outstanding units | 184,281,253 |
OP units outstanding related to general partner | 174,865,430 | 174,749,068
Percentage of units owned by UDR | 94.90% | 94.90%
OP units outstanding related to limited partner |  | 9,421,302
Percentage of units outstanding in Heritage OP |  | 5.10%

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