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Noncontrolling Interests (Details)
shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
Noncontrolling Interest [Line Items]                      
Net Income (Loss) Attributable to Noncontrolling Interest                 $ 3 $ (3) $ (60)
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount $ 946,436       $ 282,480       946,436 282,480 217,597
Net (loss)/income attributable to common stockholders 161,270 $ 12,361 $ 85,924 $ 72,891 64,486 $ 39,618 $ 29,076 $ 17,430 $ 336,661 150,610 41,088
Number of Apartment Homes Acquired                 358    
Change in equity from net loss income attributable to common stockholders and conversion of operating partnership units to companys common stock                 $ 340,478 154,982 42,905
Number of Communities Acquired                 4    
Redeemable noncontrolling interests in the Operating Partnership                      
Beginning redeemable non-controlling interests in the Operating Partnership       $ 282,480         $ 282,480    
Mark to market adjustment to redeemable non-controlling interests in the Operating Partnership                 $ 102,703 $ 73,954 3,656
Stock Issued During Period, Shares, Acquisitions | shares                 563,836 0  
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership                 $ (3,817) $ (4,372) (1,817)
Net income attributable to redeemable non-controlling interests in the Operating Partnership                 16,773 5,511 1,530
Distributions to redeemable non-controlling interests in the Operating Partnership                 15,231 10,077  
Ending redeemable non-controlling interests in the Operating Partnership $ 946,436       $ 282,480       946,436 282,480  
Net income/(loss) attributable to non-controlling interests                 $ 3 (3) (60)
UDR DownREIT Unit [Member]                      
Noncontrolling Interest [Line Items]                      
Equity Method Investment, Ownership Percentage 50.10%               50.10%    
Noncontrolling Interest                      
Redeemable noncontrolling interests in the Operating Partnership                      
Net income/(loss) attributable to non-controlling interests                 $ 3 (3) (60)
RedeemableNoncontrollingInterest [Member]                      
Redeemable noncontrolling interests in the Operating Partnership                      
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest                 $ (308) $ (133) $ 250
UDR, Inc. | UDR DownREIT Unit [Member]                      
Noncontrolling Interest [Line Items]                      
Equity Method Investment, Ownership Percentage 8.50%               8.50%    
United Dominion Reality L.P. | UDR DownREIT Unit [Member]                      
Noncontrolling Interest [Line Items]                      
Equity Method Investment, Ownership Percentage 41.60%               41.60%