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Consolidation and Basis of Presentation (UNITED DOMINION REALTY, L.P.) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2012 Communities Markets Apartment_Homes	Jun. 30, 2011	Jun. 30, 2012 Communities Markets Apartment_Homes	Jun. 30, 2011	Dec. 31, 2011
Entity Information [Line Items]
Number of communities owned (in communities)	145		145
Number of apartments owned (in apartments homes)	41,681		41,681
Operating Partnership outstanding units	184,281,253		184,281,253
OP units outstanding related to general partner	174,865,430		174,865,430		174,749,068
Percentage of units owned by UDR	94.90%		94.90%		94.90%
OP units outstanding related to limited partner					9,421,302
Percentage of units outstanding in Heritage OP					5.10%
United Dominion Reality L.P. [Member]
Entity Information [Line Items]
Rental revenues percent of General Partner's consolidated rental revenues	55.00%	59.00%	55.00%	58.00%
Number of communities owned (in communities)	73		73
Number of markets operating within (in markets)	17		17
Number of apartments owned (in apartments homes)	21,846		21,846
OP units outstanding related to general partner	110,883		110,883		110,883
OP units outstanding related to limited partner	184,170,370		184,170,370		184,170,370

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