Minority Interest, Decrease From Redemptions, Shares

No definition available.

Name:	exr_MinorityInterestDecreaseFromRedemptionsShares
Namespace Prefix:	exr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the annual rate of return of preferred operating partnership units.

+ References

No definition available.

+ Details

Name:	exr_NoncontrollingInterestInPreferredOperatingPartnershipUnitsAnnualRateOfReturn
Namespace Prefix:	exr_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the fixed liquidation value of preferred operating partnership units.

+ References

No definition available.

+ Details

Name:	exr_NoncontrollingInterestInPreferredOperatingPartnershipUnitsFixedLiquidationValue
Namespace Prefix:	exr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Noncontrolling Interest In Preferred Operating Partnership Units, Fixed Liquidation Value, Shares

+ References

No definition available.

+ Details

Name:	exr_NoncontrollingInterestInPreferredOperatingPartnershipUnitsFixedLiquidationValueShares
Namespace Prefix:	exr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the liquidation value per unit of preferred operating partnership units.

+ References

No definition available.

+ Details

Name:	exr_NoncontrollingInterestInPreferredOperatingPartnershipUnitsLiquidationValuePerUnit
Namespace Prefix:	exr_
Data Type:	dtr-types1:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Stock Issued During Period, Shares, Redemption Of Noncontrolling Interest

+ References

No definition available.

+ Details

Name:	exr_StockIssuedDuringPeriodSharesRedemptionOfNoncontrollingInterest
Namespace Prefix:	exr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- 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

- Definition

The number of preferred units outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

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Namespace Prefix:
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- Details

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

- Details

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- Details

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- Details

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- Details

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

Noncontrolling Interest Represented by Preferred Operating Partnership Units - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Jan. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Noncontrolling Interest [Line Items]
Preferred units outstanding (in shares)		8,626,449
Series B Units
Noncontrolling Interest [Line Items]
Preferred units outstanding (in shares)		1,342,727
Liquidation value (in dollars per share)		$ 25.00
Fixed liquidation value		$ 33,567
Annual rate of return percentage		6.00%
Series D Units
Noncontrolling Interest [Line Items]
Liquidation value (in dollars per share)		$ 25.00
Fixed liquidation value		$ 185,257
Fixed liquidation value (in shares)		7,410,300
Redemption of Operating Partnership units (in shares)	141,435
Redemption of operating partnership units for common stock (in shares)	21,627
Series D Units \| Minimum
Noncontrolling Interest [Line Items]
Annual rate of return percentage		3.00%
Series D Units \| Maximum
Noncontrolling Interest [Line Items]
Annual rate of return percentage		5.00%
Series A Units
Noncontrolling Interest [Line Items]
Preferred units outstanding (in shares)		0	0
Series C Units
Noncontrolling Interest [Line Items]
Preferred units outstanding (in shares)		0	0