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ORGANIZATION (Details)	Jun. 30, 2025 store state
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating storage facilities in which the entity has equity interests (in stores)	2,430
Number of stores owned by franchisees and third parties	1,749
Number of operating stores owned and/or managed	4,179
Number of states in which operating storage facilities are located | state	43

X

- Definition

The number of real estate properties owned by franchisees and other third parties as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	exr_NumberOfRealEstatePropertiesFranchiseesAndOthers
Namespace Prefix:	exr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of real estate properties owned and/or managed as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	exr_NumberOfRealEstatePropertiesOwnedAndOrManaged
Namespace Prefix:	exr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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