XML 71 R56.htm IDEA: XBRL DOCUMENT
v3.25.3

SECURED AND UNSECURED DEBT, NET - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Secured Debt |  |  |  |  |  |
Percentage of secured debt which encumbers real estate owned based upon book value |  | 12.00% |  | 12.00% |  |
Percentage of secured debt of real estate owned which is unencumbered |  | 88.00% |  | 88.00% |  |
Payments on secured debt |  |  |  | $ 49,088 | $ 136,631 |
Total Debt, net |  | $ 5,834,169 |  | 5,834,169 |  | $ 5,826,965
Outstanding balances |  | $ 5,849,396 |  | $ 5,849,396 |  |
All-in weighted average interest rate |  | 4.04% |  | 4.04% |  |
3.00% Medium-Term Notes due August 2031 |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Outstanding balances |  | $ 600,000 |  | $ 600,000 |  |
Interest rate risk |  | $ 250,000 |  | $ 250,000 |  |
All-in weighted average interest rate |  | 3.01% |  | 3.01% |  |
5.125% Medium-Term Note due September 2034 |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
All-in weighted average interest rate |  | 4.95% |  | 4.95% |  |
Unsecured Debt |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Total Debt, net |  | $ 4,743,864 |  | $ 4,743,864 |  | 4,687,634
Outstanding balances |  | 4,755,686 |  | 4,755,686 |  |
Secured Debt |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Total Debt, net |  | 1,090,305 |  | 1,090,305 |  | 1,139,331
Outstanding balances |  | $ 1,093,710 |  | $ 1,093,710 |  |
Fixed Rate Debt | Mortgages loans |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Payments on secured debt | $ 44,300 |  |  |  |  |
Fixed Rate Debt | Mortgages loans | Minimum |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Notes payable maximum interest rates range |  | 2.62% |  | 2.62% |  |
Fixed Rate Debt | Mortgages loans | Maximum |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Notes payable maximum interest rates range |  | 4.39% |  | 4.39% |  |
Fixed Rate Debt | Unsecured Debt | 2.95% Medium-Term Note due September 2026 |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Outstanding balances |  | $ 300,000 |  | $ 300,000 |  | $ 300,000
Stated interest rate |  | 2.95% |  | 2.95% |  | 2.95%
Fixed Rate Debt | Unsecured Debt | 3.50 Medium-Term Note due July 2027 |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Total Debt, net |  | $ 299,877 |  | $ 299,877 |  | $ 299,824
Stated interest rate |  | 3.50% |  | 3.50% |  | 3.50%
Unamortized discount |  | $ (123) |  | $ (123) |  | $ (176)
Fixed Rate Debt | Unsecured Debt | 4.40% Medium-Term Notes due January 2029 |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Principal outstanding |  | 300,000 |  | 300,000 |  |
Total Debt, net |  | $ 299,998 |  | $ 299,998 |  | $ 299,998
Stated interest rate |  | 4.40% |  | 4.40% |  | 4.40%
Portion of medium term note subject to interest rate swaps |  | $ 150,000 |  | $ 150,000 |  |
All-in weighted average interest rate |  | 4.27% |  | 4.27% |  |
Unamortized discount |  | $ (2) |  | $ (2) |  | $ (2)
Fixed Rate Debt | Unsecured Debt | 3.20% Medium-Term Notes due January 2030 |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Total Debt, net |  | $ 605,892 |  | $ 605,892 |  | $ 606,921
Stated interest rate |  | 3.20% |  | 3.20% |  | 3.20%
All-in weighted average interest rate |  | 3.32% |  | 3.32% |  |
Unamortized net premium |  | $ 5,892 |  | $ 5,892 |  | $ 6,921
Fixed Rate Debt | Unsecured Debt | 3.00% Medium-Term Notes due August 2031 |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Total Debt, net |  | $ 607,018 |  | $ 607,018 |  | $ 607,914
Stated interest rate |  | 3.00% |  | 3.00% |  | 3.00%
Unamortized net premium |  | $ 7,018 |  | $ 7,018 |  | $ 7,914
Fixed Rate Debt | Unsecured Debt | 3.10% senior unsecured notes due 2034 |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
All-in weighted average interest rate |  | 3.13% |  | 3.13% |  |
Fixed Rate Debt | Secured Debt |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Total Debt, net |  | $ 1,063,350 |  | $ 1,063,350 |  | 1,112,369
Fixed Rate Debt | Secured Debt | Mortgages loans |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Outstanding balances |  | 1,066,710 |  | 1,066,710 |  | 1,115,798
Fixed Rate Debt | Secured Debt | 5.125% Medium-Term Note due September 2034 |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Total Debt, net |  | $ 297,275 |  | $ 297,275 |  | $ 297,046
Stated interest rate |  | 5.125% |  | 5.125% |  | 5.125%
Unamortized discount |  | $ (2,725) |  | $ (2,725) |  | $ (2,954)
Fixed Rate Debt | Debt Assumed As Part of Acquisition | Mortgages loans |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Amortization of debt discount (Premium) |  | 100 | $ 200 | 600 | $ 1,000 |
Unamortized discount |  | (400) |  | (400) |  |
Unamortized net premium |  |  |  |  |  | 200
Variable Rate Debt | Secured Debt |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Total Debt, net |  | 26,955 |  | 26,955 |  | 26,962
Variable Rate Debt | Secured Debt | Tax-exempt secured notes payable |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Outstanding balances |  | 27,000 |  | 27,000 |  | $ 27,000
Variable Rate Debt | Tax-exempt secured notes payable | Mortgages loans |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Principal outstanding |  | $ 27,000 |  | $ 27,000 |  |
Variable Rate Debt | Tax-exempt secured notes payable | Mortgages loans |  |  |  |  |  |
Secured Debt |  |  |  |  |  |
Notes payable maximum interest rates range |  | 3.26% |  | 3.26% |  |

X
- Definition Portion of Medium Term Note subject to Interest Rate Swaps + References No definition available. + Details
Name: | udr_PortionOfMediumTermNoteSubjectToInterestRateSwaps
Namespace Prefix: | udr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Secured Debt, Encumbers Real Estate Owned, Percent. + References No definition available. + Details
Name: | udr_SecuredDebtEncumbersRealEstateOwnedPercent
Namespace Prefix: | udr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Secured debt including debt on real estate held for sale. + References No definition available. + Details
Name: | udr_SecuredDebtIncludingDebtOnRealEstateHeldForSale
Namespace Prefix: | udr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Secured debt. + References No definition available. + Details
Name: | udr_SecuredDebtTextualAbstract
Namespace Prefix: | udr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Secured Debt, Unencumbered Real Estate Owned, Percent. + References No definition available. + Details
Name: | udr_SecuredDebtUnencumberedRealEstateOwnedPercent
Namespace Prefix: | udr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-3 + Details
Name: | us-gaap_AmortizationOfDebtDiscountPremium
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
Name: | us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482949/835-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482900/835-30-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-6 + Details
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-1A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482900/835-30-50-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after accumulated amortization, of debt premium. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-1A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482900/835-30-50-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D + Details
Name: | us-gaap_DebtInstrumentUnamortizedPremium
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5C -Subparagraph (SX 210.12-13C(Column E)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5C Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13(Column D)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5A -Subparagraph (SX 210.12-13A(Column D)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5B -Subparagraph (SX 210.12-13B(Column A)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5B + Details
Name: | us-gaap_DerivativeLiabilityNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482949/835-30-55-8 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
Name: | us-gaap_RepaymentsOfSecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_MediumTerm3.00PercentageNoteDueAugust2031Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_MediumTerm5.125PercentageNoteDueSeptember2034Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=udr_FixedRateDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_MortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_A2.95MediumTermNoteDueSeptember2026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_A3.50MediumTermNoteDueJuly2027Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_FourPointFourZeroPercentMediumTermNoteDueJanuaryTwoThousandTwentyNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_SeniorUnsecuredMediumTermNotes3.2PercentDueJanuary2030Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_ThreePointOneZeroPercentSeniorUnsecuredNotesDue2034Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_DebtAssumedAsPartOfAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=udr_VariableRateDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_TaxExemptNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_TaxExemptNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_TaxExemptSecuredNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |