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INVESTMENTS IN UNCONSOLIDATED REAL ESTATE ENTITIES (Details) $ in Thousands				1 Months Ended		3 Months Ended				6 Months Ended
	Apr. 30, 2025 USD ($) property jointVenture	Mar. 31, 2025 property	Feb. 04, 2025 USD ($)	May 31, 2023 USD ($)	Oct. 31, 2019 USD ($)	Jun. 30, 2025 USD ($) property	Mar. 31, 2025 USD ($) property	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2025 USD ($) property	Jun. 30, 2024 USD ($)	Apr. 04, 2025 USD ($)	Dec. 31, 2024 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of Stores | property						414				414
Investment balance						$ 1,012,156				$ 1,012,156			$ 1,257,019
Investments in unconsolidated real estate entities						1,088,983				1,088,983			1,332,338
Cash distributions in unconsolidated real estate ventures						(76,827)				(76,827)			(75,319)
Assumed debt						$ 258,000	$ 0	$ 0	$ 0	$ 258,000	$ 0
PRISA Self Storage LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property						85				85
Equity Ownership %						4.00%				4.00%
Excess Profit %						4.00%				4.00%
Investment balance						$ 8,815				$ 8,815			8,967
HF1 Sovran HHF Storage Holdings LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property						37				37
Equity Ownership %						49.00%				49.00%
Investment balance						$ 302,275				$ 302,275			304,526
HF1 Sovran HHF Storage Holdings LLC | Minimum
Schedule of Equity Method Investments [Line Items]
Excess Profit %						49.00%				49.00%
HF1 Sovran HHF Storage Holdings LLC | Maximum
Schedule of Equity Method Investments [Line Items]
Excess Profit %						59.00%				59.00%
Storage Portfolio II JV LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property						36				36
Equity Ownership %						10.00%				10.00%
Excess Profit %						30.00%				30.00%
Investment balance						$ (10,085)				$ (10,085)			(9,584)
Storage Portfolio IV JV LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property						32				32
Equity Ownership %						10.00%				10.00%
Excess Profit %						30.00%				30.00%
Investment balance						$ 46,626				$ 46,626			47,150
Storage Portfolio I LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property						24				24
Equity Ownership %						34.00%				34.00%
Excess Profit %						49.00%				49.00%
Investment balance						$ (43,951)				$ (43,951)			(43,803)
ESS CA-TIVS JV LP
Schedule of Equity Method Investments [Line Items]
Number of Stores | property						0				0
Equity Ownership %						55.00%				55.00%
Investment balance						$ 0				$ 0			27,217
ESS CA-TIVS JV LP | Minimum
Schedule of Equity Method Investments [Line Items]
Excess Profit %						55.00%				55.00%
ESS CA-TIVS JV LP | Maximum
Schedule of Equity Method Investments [Line Items]
Excess Profit %						65.00%				65.00%
HF2 Sovran HHF Storage Holdings II LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property						22				22
Equity Ownership %						49.00%				49.00%
Investment balance						$ 113,120				$ 113,120			114,034
HF2 Sovran HHF Storage Holdings II LLC | Minimum
Schedule of Equity Method Investments [Line Items]
Excess Profit %						49.00%				49.00%
HF2 Sovran HHF Storage Holdings II LLC | Maximum
Schedule of Equity Method Investments [Line Items]
Excess Profit %						59.00%				59.00%
HF5 Life Storage-HIERS Storage LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property						17				17
Equity Ownership %						20.00%				20.00%
Excess Profit %						20.00%				20.00%
Investment balance						$ 24,842				$ 24,842			25,192
HF6 191 V Life Storage Holdings LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property						17				17
Equity Ownership %						20.00%				20.00%
Excess Profit %						20.00%				20.00%
Investment balance						$ 10,175				$ 10,175			10,821
PR II EXR JV LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property		6				0	6			0
Equity Ownership %		25.00%					25.00%
Excess Profit %						25.00%				25.00%
Investment balance						$ 0				$ 0			105,909
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
Schedule of Equity Method Investments [Line Items]
Number of Stores | property		17					17
Number of properties acquired | property		17					17
Equity ownership percentage exchanged		75.00%					75.00%
Number of properties exchanged | property		6					6
VRS Self Storage, LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property						16				16
Equity Ownership %						45.00%				45.00%
Excess Profit %						54.00%				54.00%
Investment balance						$ (18,226)				$ (18,226)			(17,557)
HF10 Life Storage HHF Wasatch Holdings LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property						16				16
Equity Ownership %						20.00%				20.00%
Excess Profit %						20.00%				20.00%
Investment balance						$ 18,620				$ 18,620			19,295
Other unconsolidated real estate ventures
Schedule of Equity Method Investments [Line Items]
Number of Stores | property						112				112
Investment balance						$ 309,945				$ 309,945			314,852
Other unconsolidated real estate ventures | Minimum
Schedule of Equity Method Investments [Line Items]
Equity Ownership %						10.00%				10.00%
Excess Profit %						10.00%				10.00%
Other unconsolidated real estate ventures | Maximum
Schedule of Equity Method Investments [Line Items]
Equity Ownership %						50.00%				50.00%
Excess Profit %						50.00%				50.00%
Strategic Storage Growth Trust III, Inc. Preferred Stock
Schedule of Equity Method Investments [Line Items]
Investment balance						$ 100,000				$ 100,000			0
Strategic Storage Trust VI, Inc. Preferred Stock
Schedule of Equity Method Investments [Line Items]
Investment balance						150,000				150,000			150,000
Dividend rate, percentage				8.35%
Dividend rate increase, threshold				5 years
Redemption period				3 years
Investment in shares				$ 150,000
SmartStop Self Storage REIT, Inc. Preferred Stock
Schedule of Equity Method Investments [Line Items]
Investment balance					$ 200,000	$ 0				$ 0		$ 200,000	$ 200,000
Investment, preferred dividend rate					7.00%
ESS-NYFL JV LP and ESS-CA TIVS JV LP
Schedule of Equity Method Investments [Line Items]
Equity Ownership %	100.00%
Value of real estate asset acquired	$ 436,797
Assumed debt	$ 258,000
Number of properties acquired | property	27
Number of joint ventures | jointVenture	2
Strategic Storage Growth Trust III, Inc.
Schedule of Equity Method Investments [Line Items]
Investment balance			$ 100,000
Dividend rate, percentage			8.85%
Dividend rate increase, threshold			5 years
Redemption period			5 years

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