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Earnings Per Common Share - Additional Information (Detail) - $ / shares	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Average share price (in dollars per share)	$ 168.78	$ 134.24

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- Definition

Average Share Price Per Share

+ References

No definition available.

+ Details

Name:	exr_AverageSharePricePerShare
Namespace Prefix:	exr_
Data Type:	dtr-types1:perShareItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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