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Real Estate Assets - Additional Information (Details)	Mar. 31, 2022 store
Real Estate [Abstract]
Number of operating stores held-for-sale	2

X

- Definition

Number Of Operating Stores Held For Sale

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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