XML 62 R51.htm IDEA: XBRL DOCUMENT
v3.25.2

SECURED AND UNSECURED DEBT, NET - Summary (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 USD ($) community | Dec. 31, 2024 USD ($)
Secured debt instruments |  |
Total Debt, net | $ 5,775,583 | $ 5,826,965
Long-term Debt | $ 5,789,781 |
Weighted average interest rate (as a percent) | 3.35% |
Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 4 years 8 months 12 days |
Secured Debt |  |
Secured debt instruments |  |
Total Debt, net | $ 1,136,046 | 1,139,331
Long-term Debt | $ 1,139,566 |
Weighted average interest rate (as a percent) | 3.49% |
Number of Communities Encumbered | community | 20 |
Secured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 3 years 7 months 6 days |
Unsecured Debt |  |
Secured debt instruments |  |
Total Debt, net | $ 4,639,537 | 4,687,634
Long-term Debt | $ 4,650,215 |
Weighted average interest rate (as a percent) | 3.32% |
Deferred finance costs, net | $ (18,189) | (20,003)
Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 5 years |
Fixed Rate Debt | Secured Debt |  |
Secured debt instruments |  |
Total Debt, net | $ 1,109,093 | 1,112,369
Weighted average interest rate (as a percent) | 3.50% |
Number of Communities Encumbered | community | 19 |
Fixed Rate Debt | Secured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 3 years 6 months |
Variable Rate Debt | Secured Debt |  |
Secured debt instruments |  |
Total Debt, net | $ 26,953 | 26,962
Weighted average interest rate (as a percent) | 3.06% |
Number of Communities Encumbered | community | 1 |
Variable Rate Debt | Secured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 6 years 8 months 12 days |
Mortgages loans | Fixed Rate Debt | Secured Debt |  |
Secured debt instruments |  |
Deferred financing costs and other non-cash adjustments | $ 3,473 | 3,429
Long-term Debt | $ 1,112,566 | 1,115,798
Weighted average interest rate (as a percent) | 3.49% |
Number of Communities Encumbered | community | 19 |
Mortgages loans | Fixed Rate Debt | Secured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 3 years 6 months |
Tax-exempt secured notes payable | Variable Rate Debt | Secured Debt |  |
Secured debt instruments |  |
Long-term Debt | $ 27,000 | 27,000
Weighted average interest rate (as a percent) | 3.02% |
Number of Communities Encumbered | community | 1 |
Deferred finance costs, net | $ (47) | (38)
Tax-exempt secured notes payable | Variable Rate Debt | Secured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 6 years 8 months 12 days |
Borrowings outstanding under unsecured credit facility due January 2026 | Variable Rate Debt | Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 3 years 2 months 12 days |
Commercial Paper | Variable Rate Debt | Unsecured Debt |  |
Secured debt instruments |  |
Borrowings outstanding | $ 220,000 | 289,900
Weighted average interest rate (as a percent) | 4.65% |
Commercial Paper | Variable Rate Debt | Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 1 month 6 days |
Working capital credit facility | Variable Rate Debt | Unsecured Debt |  |
Secured debt instruments |  |
Borrowings outstanding | $ 30,215 | 9,361
Weighted average interest rate (as a percent) | 5.17% |
Working capital credit facility | Variable Rate Debt | Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 6 months |
Term Loan due January 2027 | Fixed Rate Debt | Unsecured Debt |  |
Secured debt instruments |  |
Long-term Debt | $ 175,000 | 175,000
Weighted average interest rate (as a percent) | 1.43% |
Term Loan due January 2027 | Fixed Rate Debt | Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 1 year 7 months 6 days |
Term Loan due January 2027 | Variable Rate Debt | Unsecured Debt |  |
Secured debt instruments |  |
Long-term Debt | $ 175,000 | 175,000
Weighted average interest rate (as a percent) | 5.23% |
Term Loan due January 2027 | Variable Rate Debt | Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 1 year 7 months 6 days |
2.95% Medium-Term Note due September 2026 | Fixed Rate Debt | Unsecured Debt |  |
Secured debt instruments |  |
Long-term Debt | $ 300,000 | $ 300,000
Stated interest rate | 2.95% | 2.95%
Weighted average interest rate (as a percent) | 2.95% |
2.95% Medium-Term Note due September 2026 | Fixed Rate Debt | Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 1 year 2 months 12 days |
3.50 Medium-Term Note due July 2027 | Fixed Rate Debt | Unsecured Debt |  |
Secured debt instruments |  |
Total Debt, net | $ 299,859 | $ 299,824
Stated interest rate | 3.50% | 3.50%
Unamortized discount | $ 141 | $ 176
Weighted average interest rate (as a percent) | 4.03% |
3.50 Medium-Term Note due July 2027 | Fixed Rate Debt | Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 2 years |
3.50% Medium-Term Notes Due January 2028 | Fixed Rate Debt | Unsecured Debt |  |
Secured debt instruments |  |
Total Debt, net | $ 299,698 | $ 299,639
Stated interest rate | 3.50% | 3.50%
Unamortized discount | $ 302 | $ 361
Weighted average interest rate (as a percent) | 3.50% |
3.50% Medium-Term Notes Due January 2028 | Fixed Rate Debt | Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 2 years 6 months |
4.40% Medium-Term Notes due January 2029 | Fixed Rate Debt | Unsecured Debt |  |
Secured debt instruments |  |
Total Debt, net | $ 299,998 | $ 299,998
Stated interest rate | 4.40% | 4.40%
Unamortized discount | $ 2 | $ 2
Weighted average interest rate (as a percent) | 4.27% |
4.40% Medium-Term Notes due January 2029 | Fixed Rate Debt | Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 3 years 7 months 6 days |
3.20% Medium-Term Notes due January 2030 | Fixed Rate Debt | Unsecured Debt |  |
Secured debt instruments |  |
Total Debt, net | $ 606,235 | $ 606,921
Stated interest rate | 3.20% | 3.20%
Unamortized net premium | $ 6,235 | $ 6,921
Weighted average interest rate (as a percent) | 3.32% |
3.20% Medium-Term Notes due January 2030 | Fixed Rate Debt | Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 4 years 6 months |
3.00% Medium-Term Notes due August 2031 |  |
Secured debt instruments |  |
Long-term Debt | $ 600,000 |
3.00% Medium-Term Notes due August 2031 | Fixed Rate Debt | Unsecured Debt |  |
Secured debt instruments |  |
Total Debt, net | $ 607,317 | $ 607,914
Stated interest rate | 3.00% | 3.00%
Unamortized net premium | $ 7,317 | $ 7,914
Weighted average interest rate (as a percent) | 3.01% |
3.00% Medium-Term Notes due August 2031 | Fixed Rate Debt | Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 6 years 1 month 6 days |
2.10% Medium Term Note Due August 2032 | Fixed Rate Debt | Unsecured Debt |  |
Secured debt instruments |  |
Total Debt, net | $ 399,750 | $ 399,733
Stated interest rate | 2.10% | 2.10%
Unamortized discount | $ 250 | $ 267
Weighted average interest rate (as a percent) | 2.10% |
2.10% Medium Term Note Due August 2032 | Fixed Rate Debt | Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 7 years 1 month 6 days |
1.90% Medium-Term Notes due March 2033 | Fixed Rate Debt | Unsecured Debt |  |
Secured debt instruments |  |
Total Debt, net | $ 349,071 | $ 349,011
Stated interest rate | 1.90% | 1.90%
Unamortized discount | $ 929 | $ 989
Weighted average interest rate (as a percent) | 1.90% |
1.90% Medium-Term Notes due March 2033 | Fixed Rate Debt | Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 7 years 8 months 12 days |
2.10% Medium-Term Note due June 2033 | Fixed Rate Debt | Unsecured Debt |  |
Secured debt instruments |  |
Total Debt, net | $ 299,208 | $ 299,158
Stated interest rate | 2.10% | 2.10%
Unamortized discount | $ 792 | $ 842
Weighted average interest rate (as a percent) | 2.10% |
2.10% Medium-Term Note due June 2033 | Fixed Rate Debt | Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 8 years |
5.125% Medium-Term Note due September 2034 | Fixed Rate Debt | Secured Debt |  |
Secured debt instruments |  |
Total Debt, net | $ 297,199 | $ 297,046
Stated interest rate | 5.125% | 5.125%
Unamortized discount | $ 2,801 | $ 2,954
Weighted average interest rate (as a percent) | 4.95% |
5.125% Medium-Term Note due September 2034 | Fixed Rate Debt | Secured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 9 years 2 months 12 days |
3.10% Medium-Term Notes due November 2034 | Fixed Rate Debt | Unsecured Debt |  |
Secured debt instruments |  |
Total Debt, net | $ 299,176 | $ 299,132
Stated interest rate | 3.10% | 3.10%
Unamortized discount | $ 824 | $ 868
Weighted average interest rate (as a percent) | 3.13% |
3.10% Medium-Term Notes due November 2034 | Fixed Rate Debt | Unsecured Debt | Weighted Average |  |
Secured debt instruments |  |
Years to maturity | 9 years 3 months 18 days |

X
- Definition Number of Communities Encumbered. + References No definition available. + Details
Name: | udr_NumberOfCommunitiesEncumbered
Namespace Prefix: | udr_
Data Type: | xbrli:integerItemType
Balance Type: | na
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 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 Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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 of unamortized debt discount (premium) and debt issuance costs. + 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://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 3: 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 4: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 5: 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 6: 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 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
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
- References No definition available. + Details
Name: | us-gaap_DebtInstrumentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + 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_DeferredFinanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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/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 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
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_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
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_FinancialInstrumentAxis=udr_VariableRateDebtMember
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: | us-gaap_DebtInstrumentAxis=udr_TaxExemptNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_UnsecuredRevolvingCreditFacilityDueJanuary2026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_TermLoanFacilityDueJanuary2027Member
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_A3.50MediumTermNotesDueJanuary2028Member
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_MediumTerm3.00PercentageNoteDueAugust2031Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_TwoPointOneZeroPercentMediumTermNoteDueAugust12032Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_MediumTerm1.90PercentageNoteDueMarch2033Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_SeniorUnsecuredMediumTerm2.10PercentNoteDue2033Member
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_DebtInstrumentAxis=udr_MediumTerm3.10PercentageNoteDueNovember2034Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |