XML 48 R37.htm IDEA: XBRL DOCUMENT
v3.21.2

BASIS OF PRESENTATION (Details) shares in Millions | Jun. 30, 2021 home community shares
--- | ---
Consolidation And Basis Of Presentation |
Number of Real Estate Properties | community | 153
Number Of Apartment Homes Owned And Consolidated By Company | home | 50,413
Operating Partnership outstanding units | 185.2
United Dominion Reality L.P. |
Consolidation And Basis Of Presentation |
Operating Partnership units outstanding related to limited partner | 176.2
General Partnership units outstanding | 0.1
General Partners' ownership (as a percent) | 95.10%
UDR Lighthouse DownREIT L.P. |
Consolidation And Basis Of Presentation |
Operating Partnership outstanding units | 32.4
Non-affiliated Partners |
Consolidation And Basis Of Presentation |
Operating Partnership units outstanding related to limited partner | 9.0
Percentage of units outstanding in Partnership | 4.90%
Non-affiliated Partners | UDR Lighthouse DownREIT L.P. |
Consolidation And Basis Of Presentation |
Operating Partnership outstanding units | 13.6
Percentage of units outstanding in Partnership | 42.00%
UDR, Inc. |
Consolidation And Basis Of Presentation |
General Partners' ownership (as a percent) | 58.00%
Operating Partnership outstanding units | 18.8

X
- Definition Consolidation and basis of presentation. + References No definition available. + Details
Name: | udr_ConsolidationAndBasisOfPresentationTextualAbstract
Namespace Prefix: | udr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition General Partners Capital Account Units Owned Percentage. + References No definition available. + Details
Name: | udr_GeneralPartnersCapitalAccountUnitsOwnedPercentage
Namespace Prefix: | udr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Limited Partners Capital Account Units Outstanding Percentage. + References No definition available. + Details
Name: | udr_LimitedPartnersCapitalAccountUnitsOutstandingPercentage
Namespace Prefix: | udr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Apartment Homes Owned And Consolidated By Company + References No definition available. + Details
Name: | udr_NumberOfApartmentHomesOwnedAndConsolidatedByCompany
Namespace Prefix: | udr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of general partner units outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770 + Details
Name: | us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of limited partner units outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770 + Details
Name: | us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- Definition The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.16(a)) -URI http://asc.fasb.org/extlink&oid=120401414&loc=d3e603758-122996 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.16(b)) -URI http://asc.fasb.org/extlink&oid=120401414&loc=d3e603758-122996 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770 + Details
Name: | us-gaap_PartnersCapitalAccountUnits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_OwnershipAxis=udr_UnitedDominionRealityLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=udr_UDRLighthouseDownREITL.P.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=udr_NonAffiliatedPartnersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=udr_UDRLighthouseDownREITL.P.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=udr_UdrIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |