Consolidation and Basis of Presentation (Details)	Jun. 30, 2011
Consolidation and Basis of Presentation (Textuals) [Abstract]
Operating Partnership outstanding units	182,479,015
OP units outstanding related to general partner	174,849,339
Percentage of units owned by UDR	95.80%
OP units outstanding related to limited partner	7,629,676
Percentage of units outstanding in Heritage OP	4.20%