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REAL ESTATE ASSETS - Additional Information (Details) | Mar. 31, 2025 store
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Real Estate [Abstract] |
Number of operating stores held-for-sale | 5

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- Definition Number Of Operating Stores Held For Sale + References No definition available. + Details
Name: | exr_NumberOfOperatingStoresHeldForSale
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_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration