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Organization (Detail) | Sep. 30, 2024 state store
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Number of operating storage facilities in which the entity has equity interests (in stores) | 2,401
Number of stores owned by franchisees and third parties | 1,461
Number of operating stores owned and/or managed | 3,862
Number of states in which operating storage facilities are located | state | 42

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- Definition The number of real estate properties owned by franchisees and other third parties as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | exr_
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Balance Type: | na
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- Definition The number of real estate properties owned and/or managed as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | exr_
Data Type: | xbrli:integerItemType
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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
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- References No definition available. + Details
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