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Noncontrolling Interest Represented by Preferred Operating Partnership Units - Balances of OP Units (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Noncontrolling Interest [Line Items]
Noncontrolling interest represented by Preferred Operating Partnership units, net	$ 218,824	$ 222,360
Series B Units
Noncontrolling Interest [Line Items]
Noncontrolling interest represented by Preferred Operating Partnership units, net	33,567	33,567
Series D Units
Noncontrolling Interest [Line Items]
Noncontrolling interest represented by Preferred Operating Partnership units, net	$ 185,257	$ 188,793

X

- 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

X

- 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

Name:	us-gaap_MinorityInterestLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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