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-types: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-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480070/505-10-S50-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 23
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481231/810-10-45-23

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481231/810-10-45-24

+ Details

Name:	us-gaap_MinorityInterestDecreaseFromRedemptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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://www.xbrl.org/2009/role/commonPracticeRef
-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

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480100/505-10-S45-8

+ Details

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

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=exr_RedemptionOfUnitsForCashMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
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	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Noncontrolling Interest [Line Items]
Preferred units outstanding (in shares)	9,379,076		9,379,076
Redemption Of Units For Cash
Noncontrolling Interest [Line Items]
Redemption of noncontrolling interests for cash	$ 5,999	$ 279	$ 13,655	$ 279
Series A Units
Noncontrolling Interest [Line Items]
Preferred units outstanding (in shares)	0		0		0
Series B Units
Noncontrolling Interest [Line Items]
Preferred units outstanding (in shares)	1,342,727		1,342,727
Liquidation value (in dollars per share)	$ 25.00		$ 25.00
Fixed liquidation value	$ 33,567		$ 33,567
Annual rate of return percentage			6.00%
Series C Units
Noncontrolling Interest [Line Items]
Preferred units outstanding (in shares)	0		0		0
Series D Units
Noncontrolling Interest [Line Items]
Liquidation value (in dollars per share)	$ 25.00		$ 25.00
Fixed liquidation value	$ 14,260		$ 14,260
Fixed liquidation value (in shares)	570,395		570,395
Redemption of Operating Partnership units (in shares)			240,000
Series D Units \| Redemption Of Units For Cash
Noncontrolling Interest [Line Items]
Redemption of noncontrolling interests for cash			$ 6,000
Series D Units \| Minimum
Noncontrolling Interest [Line Items]
Annual rate of return percentage			4.00%
Series D Units \| Maximum
Noncontrolling Interest [Line Items]
Annual rate of return percentage			5.00%