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Noncontrolling Interests (Details) - Equity Component [Domain] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Noncontrolling Interest [Line Items]          
Net Income (Loss) Attributable to Noncontrolling Interest $ 0 $ 2 $ 7 $ 6  
Redeemable noncontrolling interests in the Operating Partnership 290,278   290,278   $ 282,480
Net Income (Loss) Available to Common Stockholders, Basic 85,924 29,076 158,815 46,506  
Change in equity from net income(loss) attributable to common stockholders and conversion of OP Units to UDR Common Stock 89,403 29,267 162,313 46,697  
Redeemable noncontrolling interests in the Operating Partnership          
Mark to market adjustment to redeemable noncontrolling interests in the Operating Partnership     10,930    
Adjustment for conversion of noncontrolling interest of unitholders in Operating Partnership 3,479 191 3,498 191  
Net (income)/loss attributable to redeemable non-controlling interests in Operating Partnership 3,029 $ 1,077 5,617 $ 1,724  
Distributions to redeemable noncontrolling interests in the Operating Partnership     5,250    
Redeemable non-controlling interests in operating partnership $ 290,278   290,278    
Net income attributable to non-controlling interests     $ 7