REAL ESTATE OWNED - Additional Information (Details) $ in Thousands, shares in Millions	1 Months Ended											12 Months Ended
	Dec. 31, 2025 USD ($) community home state	Nov. 30, 2025 USD ($) home	May 31, 2025 USD ($) home loan	Jan. 31, 2025 USD ($) home	Feb. 29, 2024 USD ($) home	Jan. 31, 2024 USD ($) home	Dec. 31, 2023 USD ($) home	Aug. 31, 2023 USD ($) loan community home shares	Jun. 30, 2023 USD ($) community home	Feb. 28, 2023 home	Jan. 31, 2023 USD ($)	Dec. 31, 2025 USD ($) community home state	Dec. 31, 2024 USD ($) loan	Dec. 31, 2023 USD ($)
Real Estate Owned Disclosure
Number of real estate properties | community	165											165
Real estate under development	$ 72,885											$ 72,885
Number of states in which there are owned and consolidated communities | state	12											12
Number of apartment homes owned and consolidated | home	55,240											55,240
Gain/(loss) on sale of real estate owned												$ 242,913	$ 16,867	$ 351,193
Development Costs Excluding Direct Costs and Capitalized Interest												6,800	15,100	13,100
Interest capitalized during period												8,600	$ 9,300	$ 10,100
Long-term Debt	$ 5,835,855											$ 5,835,855
Home Community, Riverside, California
Real Estate Owned Disclosure
Number of apartment homes acquired | home			478
214 Home Operating Community located in Arlington
Real Estate Owned Disclosure
Number of apartment homes sold | home					214
Proceeds from sale of real estate					$ 100,000
Gain/(loss) on sale of real estate owned					$ 16,900
188 Home Operating Community located in Brooklyn
Real Estate Owned Disclosure
Number of apartment homes acquired | home				188
Proceeds from sale of real estate				$ 127,500
Gain/(loss) on sale of real estate owned				$ 23,500
185 Home Operating Community located Englewood
Real Estate Owned Disclosure
Number of apartment homes acquired | home				185
Proceeds from sale of real estate				$ 84,000
Gain/(loss) on sale of real estate owned				$ 24,400
Retail Component of Development Community Located in Washington D.C. | Disposal Group Disposed of by Sale, Not Discontinued Operations
Real Estate Owned Disclosure
Proceeds from sale of real estate											$ 14,400
276 Home Operating Community located in Hillsboro
Real Estate Owned Disclosure
Number of apartment homes sold | home							276
Proceeds from sale of real estate							$ 78,600
Gain/(loss) on sale of real estate owned							$ 25,300
Maximum | Retail Component of Development Community Located in Washington D.C. | Disposal Group Disposed of by Sale, Not Discontinued Operations
Real Estate Owned Disclosure
Gain/(loss) on sale of real estate owned											$ 100
Notes Due October 2025 and May 2026
Real Estate Owned Disclosure
Number of loans | loan			3										3
Four Wholly-Owned Operating Communities
Real Estate Owned Disclosure
UDR's ownership interest	51.00%								51.00%			51.00%
Texas Operating Communities
Real Estate Owned Disclosure
Number of Communities Acquired | community								6
Number of apartment homes acquired | home								1,753
Increase from acquisition								$ 344,800
Real estate in-place lease intangibles								9,800
Unamortized discount								$ (17,600)
Number of mortgage loans acquired | loan								6
Real estate acquired, Purchase price								$ 354,600
Number of community issued (in shares) | shares								3.6
Number of valued								$ 141,400
Texas Operating Communities | Mortgages loans
Real Estate Owned Disclosure
Long term debt fair value								191,700
Long-term Debt								$ 209,400
Property in Dallas, Texas
Real Estate Owned Disclosure
Number of Communities Acquired | community								4
Property in Austin, Texas
Real Estate Owned Disclosure
Number of Communities Acquired | community								2
173 Home Operating Community in Oakland, California
Real Estate Owned Disclosure
Number of apartment homes acquired | home						173
Real estate acquired, Purchase price						$ 1,400
136 Home Operating Community in San Francisco, California
Real Estate Owned Disclosure
Number of apartment homes acquired | home										136
Four Wholly-Owned Operating Communities
Real Estate Owned Disclosure
Number of apartment homes acquired | home	974								1,328
Proceeds from sale of real estate	$ 202,800								$ 247,900
Gain/(loss) on sale of real estate owned	$ 195,000								$ 325,900
Number of wholly owned communities contributed | community	4								4
Home operating community in Philadelphia, Pennsylvania
Real Estate Owned Disclosure
Developer paid for unpaid interest and reimbursement costs			$ 6,700
Increase from acquisition			166,000
Increase in real estate assets due to acquisition			10,100
Real estate in-place lease intangibles			6,400
Gain on consolidation			300
Home operating community in Philadelphia, Pennsylvania | Operating Community
Real Estate Owned Disclosure
Developer paid for unpaid interest and reimbursement costs			$ 6,700
Home operating community located in Woodbridge
Real Estate Owned Disclosure
Number of apartment homes acquired | home		406
Increase from acquisition		$ 144,400
Real estate in-place lease intangibles		3,300
Acquisition of real estate assets		$ 147,700
Wholly-owned - under development
Real Estate Owned Disclosure
Number of real estate properties | community	1											1
Number of apartment homes under development | home	300											300
Real estate under development	$ 72,900											$ 72,900