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Noncontrolling Interests (Tables)
6 Months Ended
Jun. 30, 2011
Noncontrolling Interest [Abstract]  
Redeemable noncontrolling interests in the Operating Partnership
         
Redeemable noncontrolling interests in the OP, December 31, 2010
  $ 119,057  
Mark to market adjustment to redeemable noncontrolling interests in the OP
    9,212  
Conversion of OP Units to Common Stock
    (48 )
Net loss attributable to redeemable noncontrolling interests in the OP
    (611 )
OP units issued for partial consideration in community acquisition
    62,879  
Distributions to redeemable noncontrolling interests in the OP
    (2,951 )
Allocation of other comprehensive (loss)/income
    (229 )
 
     
 
Redeemable noncontrolling interests in the OP, June 30, 2011
  $ 187,309  
 
     
Net loss attributable to common stockholders and transfers from redeemable noncontrolling interests
                                 
    Three Months Ended June 30,     Six Months Ended June 30,  
    2011     2010     2011     2010  
Net income/(loss) attributable to common stockholders
  $ 12,149     $ (28,968 )   $ (18,094 )   $ (55,403 )
Conversion of OP units to UDR Common Stock
    48       336       48       551  
 
                       
 
Change in equity from net (loss)/income attributable to common stockholders and conversion of OP units to UDR Common Stock
  $ 12,197     $ (28,632 )   $ (18,046 )   $ (54,852 )