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Related Party Transactions (UNITED DOMINION REALTY, L.P.) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 31, 2014
Related Party Transaction [Line Items]          
Related party management fees $ 17,700 $ 12,700 $ 12,300    
United Dominion Reality L.P.          
Related Party Transaction [Line Items]          
Net receivable balances from General Partner $ 11,270 (13,624)      
Related party management fee percentage 2.75%        
Notes payable due to General Partner $ 273,334 88,696      
United Dominion Reality L.P. | Taxable REIT Subsidiaries          
Related Party Transaction [Line Items]          
Related party management fee percentage 2.75%        
United Dominion Reality L.P. | UDR, Inc.          
Related Party Transaction [Line Items]          
General and administrative expenses allocated to the Operating Partnership by UDR $ 21,000 $ 27,400 $ 23,500    
United Dominion Reality L.P. | UDR, Inc. | Bottom Dollar guaranty          
Related Party Transaction [Line Items]          
Related party guaranty note payable interest rate   5.18%     5.18%
Notes payable due to General Partner 83,200 $ 83,300      
United Dominion Reality L.P. | UDR, Inc. | Guaranty related to community acquisition          
Related Party Transaction [Line Items]          
Notes payable due to General Partner 5,500 $ 5,500      
Number of OP Units issued as consideration for acquisition guaranteed by related party note payable (in shares)       1,802,239  
United Dominion Reality L.P. | UDR, Inc. | Note for 184.6 million [Member]          
Related Party Transaction [Line Items]          
Notes payable due to General Partner $ 184,600        
Note for 83.2 million [Member] | United Dominion Reality L.P. | UDR, Inc. | Guaranty related to community acquisition          
Related Party Transaction [Line Items]          
Related party guaranty note payable interest rate 5.18%        
Note for 5 million [Member] | United Dominion Reality L.P. | UDR, Inc. | Guaranty related to community acquisition          
Related Party Transaction [Line Items]          
Related party guaranty note payable interest rate 5.34%        
Note for 184.6 million [Member] | United Dominion Reality L.P. | UDR, Inc. | Guaranty related to community acquisition          
Related Party Transaction [Line Items]          
Related party guaranty note payable interest rate 4.12%