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Noncontrolling Interest in Operating Partnership and Other Noncontrolling Interests - Schedule of OP Unit Activity (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Jul. 20, 2023
Noncontrolling Interest [Abstract] |  |  |
OP Units redeemed for common stock (in shares) | 308,024 | 0 |
OP Units issued in conjunction with business combination acquisitions (in units) |  | 1,674,748 | 0
Value of OP Units issued in conjunction with business combination and acquisitions |  | $ 249,470 | $ 0

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- Definition Noncontrolling Interest, Operating Partnership Units Issued With Acquisition + References No definition available. + Details
Name: | exr_NoncontrollingInterestOperatingPartnershipUnitsIssuedWithAcquisition
Namespace Prefix: | exr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Noncontrolling Interest, Operating Partnership Units Issued With Acquisition, Value + References No definition available. + Details
Name: | exr_NoncontrollingInterestOperatingPartnershipUnitsIssuedWithAcquisitionValue
Namespace Prefix: | exr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Noncontrolling Interest, Operating Partnership Units Redeemed For Common Stock + References No definition available. + Details
Name: | exr_NoncontrollingInterestOperatingPartnershipUnitsRedeemedForCommonStock
Namespace Prefix: | exr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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