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Consolidation and Basis of Presentation (UNITED DOMINION REALTY, L.P.) (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Apartment_Homes
Markets
Sep. 30, 2013
Sep. 30, 2014
Apartment_Homes
Markets
Dec. 31, 2012
Dec. 31, 2013
Entity Information [Line Items]          
Number of apartments owned (in apartments homes) 40,477   40,477    
Operating Partnership outstanding units 183,278,698   183,278,698    
OP units outstanding related to general partner 174,111,227   174,111,227    
Percentage of units owned by UDR 95.00%   95.00%    
United Dominion Reality L.P. [Member]
          
Entity Information [Line Items]          
Rental revenues percent of General Partner's consolidated rental revenues 53.00% 55.00% 53.00% 54.00%  
Number of markets operating within (in markets) 17   17    
Number of apartments owned (in apartments homes) 20,753   20,753    
OP units outstanding related to general partner 110,883   110,883   110,883
OP units outstanding related to limited partner 183,167,815   183,167,815   183,167,815