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JOINT VENTURES AND PARTNERSHIPS - Summary (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) home community property	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) home community property	Sep. 30, 2021 USD ($)	Jul. 31, 2022 USD ($) home	Jun. 30, 2022 USD ($) home	Apr. 30, 2022 USD ($)	Mar. 31, 2022 USD ($) home	Dec. 31, 2021 USD ($)
Unconsolidated entities
Number of real estate properties | community	164		164
Investment in unconsolidated entities	$ 754,123		$ 754,123						$ 696,376
Sold joint ventures and other investments		$ 416		$ 3,964
Income/(loss) from investments	$ 10,003	14,450	$ 4,186	29,123
Preferred Equity Investment 1532 Harrison San Francisco, CA
Unconsolidated entities
Number of apartment homes | home	136		136
Unpaid balance of defaulted loan	$ 47,200		$ 47,200
Preferred Equity Investment Meetinghouse Portland, OR
Unconsolidated entities
Number of apartment homes | home								232
Investment in unconsolidated entities								$ 11,600
Rate								8.25%
Preferred Equity Investment Heirloom Portland, OR
Unconsolidated entities
Number of apartment homes | home						286
Investment in unconsolidated entities						$ 16,200
Rate						8.25%
Real estate technology investments RET ESG
Unconsolidated entities
Investment in unconsolidated entities							$ 4,000
UDR Commitment							$ 10,000
Operating Community
Unconsolidated entities
Investment in unconsolidated entities	253,342		253,342						270,915
Income/(loss) from investments	$ (1,827)	(3,756)	$ (6,266)	(14,659)
Operating Community | Unconsolidated Joint Venture UDR Met Life I
Unconsolidated entities
Number of real estate properties | property	1		1
Number of apartment homes | home	150		150
Investment in unconsolidated entities	$ 21,532		$ 21,532						$ 23,880
UDR's Ownership Interest	50.00%		50.00%						50.00%
Income/(loss) from investments	$ (423)	(608)	$ (1,556)	(1,922)
Operating Community | Unconsolidated Joint Venture UDR MetLife II
Unconsolidated entities
Number of real estate properties | property	7		7
Number of apartment homes | home	1,250		1,250
Investment in unconsolidated entities	$ 176,191		$ 176,191						$ 181,023
UDR's Ownership Interest	50.00%		50.00%						50.00%
Income/(loss) from investments	$ 295	(289)	$ 811	(3,126)
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	$ 55,619		$ 55,619						$ 66,012
UDR's Ownership Interest	50.60%		50.60%						50.60%
Income/(loss) from investments	$ (1,699)	(2,859)	$ (5,521)	(9,611)
Development Community | Preferred Equity Investment 1532 Harrison San Francisco, CA
Unconsolidated entities
Investment in unconsolidated entities									$ 35,248
Income/(loss) from investments	5,158	1,003	5,152	2,896
Development Community | Preferred Equity Investment 1641 Lincoln Santa Monica CA
Unconsolidated entities
Investment in unconsolidated entities	14,415		14,415						13,183
UDR Commitment	$ 8,800		$ 8,800
Rate	12.00%		12.00%
Years to Maturity			2 months 12 days
Income/(loss) from investments	$ 428	379	$ 1,232	1,093
Development Community | Preferred Equity Investment 1200 Broadway Nashville TN
Unconsolidated entities
Investment in unconsolidated entities									61,326
Income/(loss) from investments		1,837	11,893	4,936
Development Community | Preferred Equity Investment 1300 Fairmount Philadelphia, PA
Unconsolidated entities
Investment in unconsolidated entities	69,013		69,013						64,780
UDR Commitment	$ 51,393		$ 51,393
Rate	8.50%		8.50%
Years to Maturity			1 year
Income/(loss) from investments	$ 1,457	1,338	$ 4,233	3,869
Development Community | Preferred Equity Investment Modera Lake Merritt, Oakland
Unconsolidated entities
Investment in unconsolidated entities	34,073		34,073						33,828
UDR Commitment	$ 27,250		$ 27,250
Rate	9.00%		9.00%
Years to Maturity			1 year 7 months 6 days
Income/(loss) from investments	$ (1,283)	739	$ 246	2,144
Development Community | Preferred Equity Investment Thousand Oaks, CA
Unconsolidated entities
Investment in unconsolidated entities	24,342		24,342						22,764
UDR Commitment	$ 20,059		$ 20,059
Rate	9.00%		9.00%
Years to Maturity			2 years 4 months 24 days
Income/(loss) from investments	$ 544	497	$ 1,578	1,415
Development Community | Preferred Equity Investment Queens, New York
Unconsolidated entities
Investment in unconsolidated entities	53,104		53,104						48,210
UDR Commitment	$ 40,000		$ 40,000
Rate	13.00%		13.00%
Years to Maturity			2 years 9 months 18 days
Income/(loss) from investments	$ 1,693	1,496	$ 4,885	4,300
Development Community | Preferred Equity Investment Herndon, Virginia
Unconsolidated entities
Investment in unconsolidated entities	33,299		33,299						22,828
UDR Commitment	$ 30,208		$ 30,208
Rate	9.00%		9.00%
Years to Maturity			3 years 3 months 18 days
Income/(loss) from investments	$ 743	251	$ 2,105	519
Development Community | Preferred Equity Investment Allen, Texas
Unconsolidated entities
Investment in unconsolidated entities	22,009		22,009						14,134
UDR Commitment	$ 19,843		$ 19,843
Rate	9.00%		9.00%
Years to Maturity			3 years 6 months
Income/(loss) from investments	$ 490	234	$ 1,359	462
Development Community | Preferred Equity Investment Infield Phase I
Unconsolidated entities
Investment in unconsolidated entities	17,201		17,201
UDR Commitment	$ 16,044		$ 16,044
Rate	14.00%		14.00%
Years to Maturity			1 year 7 months 6 days
Income/(loss) from investments	$ 593		$ 1,129
Development Community | Preferred Equity Investment Upton Place, Washington, D C
Unconsolidated entities
Investment in unconsolidated entities	55,465		55,465						29,566
UDR Commitment	$ 52,163		$ 52,163
Rate	9.70%		9.70%
Years to Maturity			5 years 2 months 12 days
Income/(loss) from investments	$ 1,316		$ 3,061
Development Community | Preferred Equity Investment Meetinghouse Portland, OR
Unconsolidated entities
Investment in unconsolidated entities	12,007		12,007
UDR Commitment	$ 11,600		$ 11,600
Rate	8.25%		8.25%
Years to Maturity			4 years 4 months 24 days
Income/(loss) from investments	$ 239		$ 466
Development Community | Preferred Equity Investment Heirloom Portland, OR
Unconsolidated entities
Investment in unconsolidated entities	16,539		16,539
UDR Commitment	$ 16,185		$ 16,185
Rate	8.25%		8.25%
Years to Maturity			4 years 8 months 12 days
Income/(loss) from investments	$ 332		$ 347
Development Community | Real estate technology investments RETV I
Unconsolidated entities
Investment in unconsolidated entities	25,639		25,639						71,464
UDR Commitment	18,000		18,000
Income/(loss) from investments	(1,458)	9,869	(28,009)	17,975
Development Community | Real estate technology investments RETV II
Unconsolidated entities
Investment in unconsolidated entities	9,607		9,607						8,130
UDR Commitment	18,000		18,000
Income/(loss) from investments	122	147	(603)	209
Development Community | Real estate technology investments RET Strategic Fund
Unconsolidated entities
Investment in unconsolidated entities	7,435		7,435
UDR Commitment	25,000		25,000
Income/(loss) from investments	(37)		(115)
Development Community | Real estate technology investments RET ESG
Unconsolidated entities
Investment in unconsolidated entities	3,959		3,959
UDR Commitment	10,000		10,000
Income/(loss) from investments	(72)		(72)
Development Community | Preferred Equity Investments and Real Estate Technology Investments
Unconsolidated entities
Investment in unconsolidated entities	500,781		500,781						$ 425,461
Income/(loss) from investments	11,830	$ 17,790	10,452	$ 39,818
Development Community | Portfolio Recapitalization
Unconsolidated entities
Number of apartment homes | home					14
Investment in unconsolidated entities	102,674		102,674		$ 102,000
UDR Commitment	$ 102,000		$ 102,000
Rate	8.00%		8.00%		8.00%
Years to Maturity			6 years 8 months 12 days
Income/(loss) from investments	$ 1,565		$ 1,565

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