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ORGANIZATION (Details) | Jun. 30, 2025 store state
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Number of operating storage facilities in which the entity has equity interests (in stores) | 2,430
Number of stores owned by franchisees and third parties | 1,749
Number of operating stores owned and/or managed | 4,179
Number of states in which operating storage facilities are located | state | 43

X
- Definition The number of real estate properties owned by franchisees and other third parties as of the balance sheet date. + References No definition available. + Details
Name: | exr_NumberOfRealEstatePropertiesFranchiseesAndOthers
Namespace Prefix: | exr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned and/or managed as of the balance sheet date. + References No definition available. + Details
Name: | exr_NumberOfRealEstatePropertiesOwnedAndOrManaged
Namespace Prefix: | exr_
Data Type: | xbrli:integerItemType
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 states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
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