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Real Estate Assets - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 USD ($) store | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) store | Jun. 30, 2023 USD ($)
Real Estate [Abstract] |  |  |  |
Number of operating stores held-for-sale | store | 7 |  | 7 |
Loss on real estate assets held for sale | $ | $ 54,659 | $ 0 | $ 54,659 | $ 0

X
- Definition Gains losses on real estate transactions and earn out from prior acquisition and sales of other assets + References No definition available. + Details
Name: | exr_GainsLossesOnRealEstateTransactionsAndEarnOutFromPriorAcquisitionAndSaleOfOtherAssets
Namespace Prefix: | exr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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