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JOINT VENTURES AND PARTNERSHIPS - Summary (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) property home community	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) property home community	Jun. 30, 2020 USD ($)	May 31, 2021 USD ($) home	Apr. 28, 2021	Mar. 31, 2021 USD ($) home	Jan. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Unconsolidated entities
Number of real estate properties | community	153		153
Investment in unconsolidated entities	$ 613,903		$ 613,903						$ 595,486
Sold joint ventures and other investments in prior year	(3)	$ 1,389	(3)	$ 2,678
Income/(loss) from investments	9,751	8,021	14,673	11,388
Preferred Equity Investment 1200 Broadway Nashville TN
Unconsolidated entities
Rate						12.25%
Preferred Equity Investment Herndon, Virginia
Unconsolidated entities
Investment in unconsolidated entities								$ 30,200
Rate								9.00%
Preferred Equity Investment Allen, Texas
Unconsolidated entities
Number of apartment homes | home							469
Investment in unconsolidated entities							$ 19,800
Rate							9.00%
Preferred Equity Investment Kissimmee, Florida
Unconsolidated entities
Number of apartment homes | home					384
Investment in unconsolidated entities					$ 16,000
Rate					14.00%
Operating Community
Unconsolidated entities
Investment in unconsolidated entities	284,152		284,152						289,931
Income/(loss) from investments	$ (4,359)	(3,016)	$ (8,417)	(5,453)
Operating Community | Unconsolidated Joint Venture UDR Met Life I Partnership
Unconsolidated entities
Number of real estate properties | property	1		1
Number of apartment homes | home	150		150
Investment in unconsolidated entities	$ 25,095		$ 25,095						$ 26,426
UDR's Ownership Interest	50.00%		50.00%						50.00%
Income/(loss) from investments	$ (839)	(658)	$ (1,314)	(1,112)
Operating Community | Unconsolidated Joint Venture UDR MetLife II Partnership
Unconsolidated entities
Number of real estate properties | property	7		7
Number of apartment homes | home	1,250		1,250
Investment in unconsolidated entities	$ 184,568		$ 184,568						$ 151,353
UDR's Ownership Interest	50.00%		50.00%						50.00%
Income/(loss) from investments	$ (153)	10	$ (2,837)	(81)
Operating Community | Unconsolidated Joint Venture Other MetLife
Unconsolidated entities
Number of real estate properties | property	5		5
Number of apartment homes | home	1,437		1,437
Investment in unconsolidated entities	$ 74,178		$ 74,178						$ 82,072
UDR's Ownership Interest	50.60%		50.60%						50.60%
Income/(loss) from investments	$ (3,367)	(2,312)	$ (6,752)	(4,124)
Operating Community | Unconsolidated Joint Venture West Coast Development JV
Unconsolidated entities
Investment in unconsolidated entities	$ 311		$ 311						$ 30,080
UDR's Ownership Interest	47.00%		47.00%						47.00%
Income/(loss) from investments		(56)	$ 2,486	(136)
Development Community | Preferred Equity Investment 1532 Harrison San Francisco, CA
Unconsolidated entities
Investment in unconsolidated entities	$ 36,040		36,040						$ 34,135
UDR Commitment	$ 24,645		$ 24,645
Rate	11.00%		11.00%
Years to Maturity			1 year
Income/(loss) from investments	$ 963	846	$ 1,892	1,682
Development Community | Preferred Equity Investment 1641 Lincoln Santa Monica CA
Unconsolidated entities
Investment in unconsolidated entities	12,413		12,413						11,699
UDR Commitment	$ 8,800		$ 8,800
Rate	12.00%		12.00%
Years to Maturity			1 year 1 month 6 days
Income/(loss) from investments	$ 364	323	$ 714	637
Development Community | Preferred Equity Investment 1200 Broadway Nashville TN
Unconsolidated entities
Investment in unconsolidated entities	59,354		59,354						69,330
UDR Commitment	$ 55,558		$ 55,558
Rate	12.25%		12.25%
Years to Maturity			1 year 2 months 12 days
Income/(loss) from investments	$ 1,727	1,306	$ 3,099	2,587
Development Community | Preferred Equity Investment 1300 Fairmount Philadelphia, PA
Unconsolidated entities
Investment in unconsolidated entities	62,075		62,075						59,544
UDR Commitment	$ 51,393		$ 51,393
Rate	8.50%		8.50%
Years to Maturity			2 years 1 month 6 days
Income/(loss) from investments	$ 1,275	1,191	$ 2,531	2,357
Development Community | Preferred Equity Investment Essex Orlando, FL
Unconsolidated entities
Investment in unconsolidated entities	17,085		17,085						16,770
UDR Commitment	$ 12,886		$ 12,886
Rate	12.50%		12.50%
Years to Maturity			2 years 1 month 6 days
Income/(loss) from investments	$ 543	481	$ 1,065	947
Development Community | Preferred Equity Investment Modera Lake Merritt, Oakland
Unconsolidated entities
Investment in unconsolidated entities	32,334		32,334						30,928
UDR Commitment	$ 27,250		$ 27,250
Rate	9.00%		9.00%
Years to Maturity			2 years 9 months 18 days
Income/(loss) from investments	$ 714	652	$ 1,405	1,226
Development Community | Preferred Equity Investment Thousand Oaks, CA
Unconsolidated entities
Investment in unconsolidated entities	21,759		21,759						17,919
UDR Commitment	$ 20,059		$ 20,059
Rate	9.00%		9.00%
Years to Maturity			3 years 7 months 6 days
Income/(loss) from investments	$ 481	153	$ 918	177
Development Community | Preferred Equity Investment Queens, New York
Unconsolidated entities
Investment in unconsolidated entities	45,169		45,169						42,360
UDR Commitment	$ 40,000		$ 40,000
Rate	13.00%		13.00%
Years to Maturity			4 years
Income/(loss) from investments	$ 1,431		$ 2,804
Development Community | Preferred Equity Investment Herndon, Virginia
Unconsolidated entities
Investment in unconsolidated entities	9,176		9,176
UDR Commitment	$ 30,208		$ 30,208
Rate	9.00%		9.00%
Years to Maturity			4 years 6 months
Income/(loss) from investments	$ 171		$ 268
Development Community | Preferred Equity Investment Allen, Texas
Unconsolidated entities
Investment in unconsolidated entities	2,179		2,179
UDR Commitment	$ 19,846		$ 19,846
Rate	9.00%		9.00%
Years to Maturity			4 years 8 months 12 days
Income/(loss) from investments	$ 226		$ 229
Development Community | Preferred Equity Investment Infield Phase I
Unconsolidated entities
UDR Commitment	$ 16,044		$ 16,044
Rate	14.00%		14.00%
Years to Maturity			2 years 10 months 24 days
Development Community | Real estate technology investments RETV I
Unconsolidated entities
Investment in unconsolidated entities	$ 28,696		$ 28,696						20,587
UDR Commitment	18,000		18,000
Income/(loss) from investments	6,055	4,696	8,106	4,550
Development Community | Real estate technology investments RETV II
Unconsolidated entities
Investment in unconsolidated entities	3,471		3,471						2,283
UDR Commitment	18,000		18,000
Income/(loss) from investments	163		62
Development Community | Preferred Equity Investments and Real Estate Technology Investments
Unconsolidated entities
Investment in unconsolidated entities	329,751		329,751						$ 305,555
Income/(loss) from investments	$ 14,113	$ 9,648	$ 23,093	$ 14,163

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