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Noncontrolling Interests (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2012
Noncontrolling Interest [Line Items]          
Net Income (Loss) Available to Common Stockholders, Basic $ 39,618 $ 2,257 $ 86,124 $ 5,319 $ 5,319
Change in equity from net income(loss) attributable to common stockholders and conversion of OP Units to UDR Common Stock 43,745 2,257 90,442   7,030
Redeemable noncontrolling interests in the Operating Partnership          
Redeemable non-controlling interests in operating partnership     217,597    
Mark to market adjustment to redeemable noncontrolling interests in the Operating Partnership     40,771    
Conversion of OP Units to Common Stock (4,127) 0 (4,318) (1,711) (1,711)
Net (income)/loss attributable to redeemable non-controlling interests in Operating Partnership 1,447 84 3,171 198 198
Distributions to redeemable noncontrolling interests in the Operating Partnership     (7,570)    
Redeemable non-controlling interests in operating partnership 249,814   249,814    
Net income attributable to non-controlling interests $ (4) $ (37) $ 2 $ (30)