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Noncontrolling Interest Represented By Preferred Operating Partnership Units - Preferred OP Units (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Noncontrolling Interest [Line Items] |  |
Noncontrolling interest represented by Preferred Operating Partnership units | $ 76,092 | $ 222,360
Series B Units |  |
Noncontrolling Interest [Line Items] |  |
Noncontrolling interest represented by Preferred Operating Partnership units | 33,567 | 33,567
Series D Units |  |
Noncontrolling Interest [Line Items] |  |
Noncontrolling interest represented by Preferred Operating Partnership units | $ 42,525 | $ 188,793

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- Definition Carrying amount of the equity interests owned by noncontrolling preferred unit holders in an entity included in the reporting entity's consolidated financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PreferredUnitsByNameAxis=exr_SeriesDUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |