XML 62 R51.htm IDEA: XBRL DOCUMENT v3.25.1

EARNINGS PER COMMON SHARE - Additional Information (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share [Abstract]
Average share price (in dollars per share)	$ 151.64	$ 145.80

X

- 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

X

- References

No definition available.

+ Details

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