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Summary of Significant Accounting Policies - Risk Management and Use of Financial Instruments (Details) | 12 Months Ended
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Dec. 31, 2024 item
Accounting Policies [Abstract] |
Number of main components of economic risk | 3

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Namespace Prefix: | exr_
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Balance Type: | na
Period Type: | duration

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