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ACQUISITIONS AND DISPOSITIONS - Additional Information (Details) $ in Thousands			3 Months Ended				6 Months Ended
	Apr. 30, 2025 USD ($) property jointVenture	Mar. 31, 2025 property	Jun. 30, 2025 USD ($) property	Mar. 31, 2025 USD ($) property	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2025 USD ($) property land_parcel store	Jun. 30, 2024 USD ($)
Asset Acquisition [Line Items]
Total transaction value			$ 448,928	$ 248,221	$ 27,741	$ 35,255	$ 697,149	$ 62,996
Assumed debt			$ 258,000	$ 0	0	$ 0	$ 258,000	0
Number of operating properties sold			1				12
Proceeds from sale of real estate			$ 8,900				$ 133,755
Gain (loss) on disposition of assets			(864)				38,656
Loss on real estate assets held for sale and sold, net			$ 864		$ 54,659		$ (34,897)	$ 54,659
Number of land parcels sold | land_parcel							3
Number of properties listed for sale | property							3
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Asset Acquisition [Line Items]
Loss on real estate assets held for sale and sold, net							$ 3,759
PR II EXR JV LLC
Asset Acquisition [Line Items]
Equity Ownership %		25.00%		25.00%
Number of properties acquired | property		6		6
Number of properties exchanged | property		17		17
Number of properties in portfolio | property		23		23
Ownership percentage after transaction		100.00%
PR II EXR JV LLC | Partner
Asset Acquisition [Line Items]
Number of properties acquired | property		17		17
Number of properties exchanged | property		6		6
Equity ownership percentage exchanged		75.00%		75.00%
ESS-NYFL JV LP and ESS-CA TIVS JV LP
Asset Acquisition [Line Items]
Value of real estate asset acquired	$ 436,797
Assumed debt	$ 258,000
Equity Ownership %	100.00%
Number of properties acquired | property	27
Number of joint ventures | jointVenture	2

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