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Consolidation and Basis of Presentation (UNITED DOMINION REALTY, L.P.) (Details)	3 Months Ended
	Mar. 31, 2013 Communities Markets Apartment_Homes	Mar. 31, 2012	Dec. 31, 2012
Entity Information [Line Items]
Number of communities owned (in communities)	143
Number of apartments owned (in apartments homes)	41,750
Operating Partnership outstanding units	184,281,253
OP units outstanding related to general partner	174,955,272
Percentage of units owned by UDR	94.90%
United Dominion Reality L.P. [Member]
Entity Information [Line Items]
Rental revenues percent of General Partner's consolidated rental revenues	54.00%	52.00%
Number of communities owned (in communities)	70
Number of markets operating within (in markets)	18
Number of apartments owned (in apartments homes)	21,660
OP units outstanding related to general partner	110,883		110,883
OP units outstanding related to limited partner	184,170,370		184,170,370

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