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Summary of Significant Accounting Policies - Variable Interest Entities (Details) | Dec. 31, 2024 variable_interest_entity store
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Accounting Policies [Abstract] |
Number of consolidated VIEs | variable_interest_entity | 1
Consolidated VIEs, number of stores | store | 1

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- Definition Number Of Consolidated Variable Interest Entities + References No definition available. + Details
Name: | exr_NumberOfConsolidatedVariableInterestEntities
Namespace Prefix: | exr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Variable Interest Entity, Number Of Stores + References No definition available. + Details
Name: | exr_VariableInterestEntityNumberOfStores
Namespace Prefix: | exr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration