Noncontrolling Interest in Operating Partnership and Other Noncontrolling Interests - Schedule of OP Unit Activity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 30, 2022
Noncontrolling Interest [Abstract]
OP Units redeemed for cash (in shares)	0	18,028
Cash paid for OP Units redeemed	$ 0	$ 3,504
OP Units issued in conjunction with acquisitions (in units)	0	91,743

Noncontrolling Interest, Operating Partnership Units Issued With Acquisition

No definition available.

Name:	exr_NoncontrollingInterestOperatingPartnershipUnitsIssuedWithAcquisition
Namespace Prefix:	exr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant