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EARNINGS PER COMMON SHARE - Additional Information (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Earnings Per Share [Abstract]
Average share price (in dollars per share)	$ 143.62	$ 168.78	$ 146.84	$ 153.61

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- Definition

Average Share Price Per Share

+ References

No definition available.

+ Details

Name:	exr_AverageSharePricePerShare
Namespace Prefix:	exr_
Data Type:	dtr-types: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