Represents the amount the company committed to invest into the joint venture.

No definition available.

Name:	udr_EquityMethodInvestmentCommittedInvestment
Namespace Prefix:	udr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Income from Participating Loan

+ References

No definition available.

+ Details

Name:	udr_IncomeFromParticipatingLoan
Namespace Prefix:	udr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of investments which receive a variable percentage of the value created from the project upon a capital or liquidating event.

+ References

No definition available.

+ Details

Name:	udr_NumberOfInvestmentsWhichReceiveVariablePercentage
Namespace Prefix:	udr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of preferred equity agreements the company entered into during the period.

+ References

No definition available.

+ Details

Name:	udr_NumberOfPreferredEquityInvestmentsAgreementsEnteredInto
Namespace Prefix:	udr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of preferred equity agreements the company redeemed during the period.

+ References

No definition available.

+ Details

Name:	udr_NumberOfPreferredEquityInvestmentsAgreementsRedeemed
Namespace Prefix:	udr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of wholly owned communities contributed to newly formed joint venture.

+ References

No definition available.

+ Details

Name:	udr_NumberOfWhollyOwnedCommunitiesContributed
Namespace Prefix:	udr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Participating Loan, Interest Rate, Stated Percentage

+ References

No definition available.

+ Details

Name:	udr_ParticipatingLoanInterestRateStatedPercentage
Namespace Prefix:	udr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the entity's equity method investment which has been sold.

+ References

No definition available.

+ Details

Name:	us-gaap_EquityMethodInvestmentSoldCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (ee)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481664/323-10-45-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(10))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 25
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-25

+ Details

Name:	us-gaap_EquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

Name:	us-gaap_GainLossOnSaleOfInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Impairment losses measured as the amount by which the carrying amount of the business or real estate partnerships exceeds the fair value of the business or partnership.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-2

+ Details

Name:	us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of units in a real estate property owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Cash received for the sale of real estate that is not part of an investing activity during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

+ Details

Name:	us-gaap_ProceedsFromSaleOfRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

+ Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=udr_UnconsolidatedJointVentureUdrMetLifeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=udr_UnconsolidatedJointVentureUdrLasalleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=udr_PreferredEquityInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=udr_UnconsolidatedJointVenturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=udr_RealEstateTechnologyAndSustainabilityInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=udr_FourWhollyOwnedOperatingCommunitiesInVariousMarketsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=udr_OperatingCommunityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=udr_DebtAndPreferredEquityProgramCommunityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=udr_DevelopmentCommunityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=udr_FourWhollyOwnedOperatingCommunitiesInVariousMarketsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

JOINT VENTURES AND PARTNERSHIPS - Summary (Details) $ in Thousands	1 Months Ended					12 Months Ended
	Jan. 31, 2026 USD ($)	Dec. 31, 2025 USD ($) community home property	Sep. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2023 USD ($) community	Dec. 31, 2025 USD ($) community home item property	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
JOINT VENTURES AND PARTNERSHIPS
Number Properties \| community		165				165
Investment in unconsolidated entities		$ 879,735				$ 879,735	$ 912,183
Sold joint ventures and other investments - Investment							81,123
Income/(loss) from investments						28,388	20,235	$ 4,693
Equity method investment amount sold							81,123
Sold unconsolidated joint ventures and partnerships						$ 5,792	8,932	(12,154)
Number of preferred equity agreements entered into \| item						3
Number of preferred equity agreements redeemed \| item						2
UDR/MetLife
JOINT VENTURES AND PARTNERSHIPS
Number Properties \| property		13				13
Number of apartment homes \| home		2,837				2,837
Investment in unconsolidated entities		$ 189,420				$ 189,420	$ 206,308
UDR's ownership interest		50.20%				50.20%	50.20%
Income/(loss) from investments						$ (3,202)	$ (7,438)	(5,378)
UDR/LaSalle
JOINT VENTURES AND PARTNERSHIPS
Number Properties \| property		9				9
Number of apartment homes \| home		2,564				2,564
Investment in unconsolidated entities		$ 242,337				$ 242,337	$ 267,562
UDR's ownership interest		51.00%				51.00%	51.00%
Income/(loss) from investments						$ (4,332)	$ (8,027)	(3,660)
Preferred Equity Investments
JOINT VENTURES AND PARTNERSHIPS
Proceeds from Sale of Real Estate			$ 32,200	$ 54,800
Number of investments which receive a variable percentage of the value created from the project upon a capital or liquidating event \| item						2
Impairment loss							8,100
Unconsolidated Joint Ventures
JOINT VENTURES AND PARTNERSHIPS
Number Properties \| property		22				22
Number of apartment homes \| home		5,401				5,401
Investment in unconsolidated entities		$ 431,757				$ 431,757	473,870
Income/(loss) from investments						(7,534)	(15,465)	(9,038)
Real estate technology and sustainability investments
JOINT VENTURES AND PARTNERSHIPS
Investment in unconsolidated entities		74,747				74,747	57,344
Income/(loss) from investments						6,363	9,959	104
UDR Commitment		$ 86,000				$ 86,000
Four Wholly-Owned Operating Communities
JOINT VENTURES AND PARTNERSHIPS
UDR's ownership interest		51.00%			51.00%	51.00%
Operating Community \| Preferred Equity Investments
JOINT VENTURES AND PARTNERSHIPS
Number Properties \| community		12				12
Number of apartment homes		6,766				6,766
Proceeds from Sale of Real Estate		$ 10,300
Weighted Average Rate		9.70%				9.70%
Investment in unconsolidated entities		$ 373,231				$ 373,231	299,846
Income/(loss) from investments						23,767	16,809	25,781
UDR Commitment		354,989				354,989
Operating Community \| Preferred Equity Investments \| Subsequent Event
JOINT VENTURES AND PARTNERSHIPS
Proceeds from Sale of Real Estate	$ 52,900
Debt and Preferred Equity Program \| Real estate technology and sustainability investments
JOINT VENTURES AND PARTNERSHIPS
Investment in unconsolidated entities							357,190
Income/(loss) from investments						30,130	$ 26,768	$ 25,885
Development Community \| Real estate technology and sustainability investments
JOINT VENTURES AND PARTNERSHIPS
Investment in unconsolidated entities		$ 447,978				$ 447,978
Four Wholly-Owned Operating Communities
JOINT VENTURES AND PARTNERSHIPS
Number of wholly owned communities contributed \| community		4			4
Proceeds from Sale of Real Estate		$ 202,800			$ 247,900