REPORTABLE SEGMENTS (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) segment home	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segments
Same store communities | home	53,468
Reportable Segments
Management fee (as a percent)	3.25%
Number of reportable segments | segment	2
Condition for Community considered to have stabilized occupancy	90%
Time to maintain percent occupancy to be considered a community	3 months
Practical expedient, single lease component	true
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Rental income	$ 1,700,956	$ 1,663,525	$ 1,620,658
Reconciling items:
Joint venture management and other fees	$ 11,361	$ 8,317	$ 6,843
Type of revenue	udr:ManagementAndOtherFeesMember	udr:ManagementAndOtherFeesMember	udr:ManagementAndOtherFeesMember
Property management	$ (55,281)	$ (54,065)	$ (52,671)
Other operating expenses	(30,734)	(30,416)	(20,222)
Real estate depreciation and amortization	(654,121)	(676,068)	(676,419)
General and administrative	(85,104)	(84,305)	(69,929)
Casualty-related (charges)/recoveries, net	(11,682)	(15,179)	(3,138)
Other depreciation and amortization	(25,914)	(19,405)	(15,419)
Gain/(loss) on sale of real estate owned	242,913	16,867	351,193
Income/(loss) from unconsolidated entities	28,388	20,235	4,693
Interest expense	(196,619)	(195,712)	(180,866)
Interest income and other income/(expense), net	19,175	(12,336)	17,759
Tax (provision)/benefit, net	(835)	(879)	(2,106)
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(25,965)	(6,246)	(30,104)
Net (income)/loss attributable to noncontrolling interests	(46)	(46)	(31)
Net income/(loss) attributable to UDR, Inc.	377,704	89,585	444,353
Reportable apartment home segment assets:
Total segment assets	16,487,885	16,213,363
Accumulated depreciation	(7,374,546)	(6,901,026)
Total real estate owned, net of accumulated depreciation	9,113,339	9,312,337
Reconciling items:
Cash and cash equivalents	1,222	1,326	2,922	$ 1,193
Restricted cash	35,710	34,101	31,944	$ 29,001
Notes receivable, net	149,979	247,849
Investment in and advances to unconsolidated joint ventures, net	886,492	917,483
Operating lease right-of-use assets	187,624	186,997
Other assets	231,308	197,493
Total consolidated assets	10,605,674	10,897,586
Total Communities
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Lease revenue	1,638,722	1,607,919	1,570,508
Other revenue	62,234	55,606	50,150
Rental income	1,700,956	1,663,525	1,620,658
Total segment and consolidated operating expenses	538,788	524,702	505,888
Reportable apartment home segment NOI	1,162,168	1,138,823	1,114,770
Same-Store Communities
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Personnel	74,099	70,795	63,451
Utilities	73,102	69,438	66,453
Repair and maintenance	99,367	97,785	91,014
Administrative and marketing	39,007	35,565	31,765
Real estate taxes	199,444	196,006	189,373
Insurance	21,509	24,080	24,362
Same-Store Communities | West Region
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Lease revenue	496,427	483,285	468,797
Other revenue	13,919	12,199	11,771
Rental income	510,346	495,484	480,568
Reportable apartment home segment NOI	375,281	365,620	355,640
Reportable apartment home segment assets:
Total segment assets	4,686,593	4,613,733
Same-Store Communities | Northeast Region
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Lease revenue	324,572	314,446	305,364
Other revenue	9,545	8,239	7,558
Rental income	334,117	322,685	312,922
Reportable apartment home segment NOI	217,524	209,241	205,711
Reportable apartment home segment assets:
Total segment assets	3,835,341	3,788,083
Same-Store Communities | Mid-Atlantic Region
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Lease revenue	310,416	299,695	290,194
Other revenue	14,282	13,210	11,269
Rental income	324,698	312,905	301,463
Reportable apartment home segment NOI	222,797	214,376	207,223
Reportable apartment home segment assets:
Total segment assets	3,221,425	3,171,487
Same-Store Communities | Southeast Region
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Lease revenue	220,993	222,515	222,488
Other revenue	12,544	10,783	9,185
Rental income	233,537	233,298	231,673
Reportable apartment home segment NOI	158,620	159,459	159,369
Reportable apartment home segment assets:
Total segment assets	1,663,389	1,615,846
Same-Store Communities | Southwest Region
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Lease revenue	198,270	200,309	178,772
Other revenue	9,737	8,848	7,230
Rental income	208,007	209,157	186,002
Reportable apartment home segment NOI	129,955	131,164	118,267
Reportable apartment home segment assets:
Total segment assets	1,905,947	1,889,173
Non-Mature Communities/Other
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Lease revenue	88,044	87,669	104,893
Other revenue	2,207	2,327	3,137
Rental income	90,251	89,996	108,030
Other	32,260	31,033	39,470
Reportable apartment home segment NOI	57,991	58,963	$ 68,560
Reportable apartment home segment assets:
Total segment assets	$ 1,175,190	$ 1,135,041