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Consolidation and Basis of Presentation (UNITED DOMINION REALTY, L.P.) (Details)	12 Months Ended
	Dec. 31, 2015 Communities	Dec. 31, 2014 shares	Dec. 31, 2013 shares	Dec. 31, 2015	Dec. 31, 2015 USD ($)	Dec. 31, 2015 Apartment_Homes	Dec. 31, 2015 shares	Dec. 31, 2015 Markets	Dec. 31, 2012 shares
Consolidation and Basis of Presentation [Line Items]
Number of Real Estate Properties	133			2
Number of markets operating within | $					18
Number of apartments owned | Apartment_Homes						40,728
Operating Partnership outstanding units		183,278,698					183,278,698
OP units outstanding related to limited partner		183,278,698	183,278,698				183,278,698		184,281,254
Limited Partner [Member]
Consolidation and Basis of Presentation [Line Items]
Percentage of units outstanding owned by limited partners				95.10%
United Dominion Reality L.P.
Consolidation and Basis of Presentation [Line Items]
Rental revenues percent of General Partner's consolidated rental revenues	51.00%	52.00%	54.00%
Number of Real Estate Properties | Communities	57
Number of markets operating within | Markets								14
Number of apartments owned | Apartment_Homes						16,974
OP units outstanding related to general partner		110,883					110,883
Percentage of total outstanding Operating Partnership units represented by General Partnership units outstanding				0.10%
OP units outstanding related to limited partner		183,167,815					183,167,815
UDR, Inc.
Consolidation and Basis of Presentation [Line Items]
OP units outstanding related to limited partner		174,002,342					174,114,516
Percentage of units outstanding owned by limited partners		95.00%		95.10%
Non-affiliated Partners
Consolidation and Basis of Presentation [Line Items]
OP units outstanding related to limited partner		9,165,473					9,053,299
Percentage of units outstanding owned by limited partners		5.00%		4.90%
General Partner [Member]
Consolidation and Basis of Presentation [Line Items]
OP units outstanding related to limited partner		174,113,225					174,225,399
Percentage of units outstanding owned by limited partners		95.00%
Class A Limited Partner
Consolidation and Basis of Presentation [Line Items]
OP units outstanding related to limited partner							1,751,671
Class A Limited Partner | United Dominion Reality L.P.
Consolidation and Basis of Presentation [Line Items]
OP units outstanding related to limited partner		1,751,671					1,873,332

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Limited Partners Capital Account Units Outstanding Percentage.

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Number Of Apartment Homes Owned And Consolidated By Company

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Number of Markets Operating Within

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Percentage Of Total Outstanding Operating Partnership Units Represented By General Partnership Units Outstanding

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Rental Revenues, Percent of Parent Revenue

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The number of general partner units outstanding.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
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The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners.

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