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Noncontrolling Interest in Operating Partnership and Other Noncontrolling Interests - Schedule of OP Unit Activity (Details) - shares | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Noncontrolling Interest [Abstract] |  |
OP Units redeemed for common stock (in shares) | 259,145 | 0

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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