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INVESTMENTS IN UNCONSOLIDATED REAL ESTATE ENTITIES (Details) $ in Thousands			1 Months Ended
	Mar. 31, 2025 USD ($)	Feb. 04, 2025 USD ($)	May 31, 2023 USD ($)	Oct. 31, 2019 USD ($)	Mar. 31, 2025 store	Mar. 31, 2025	Mar. 31, 2025 property	Dec. 31, 2024 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of Stores | property							439
Investment balance	$ 1,244,752							$ 1,257,019
Investments in unconsolidated real estate entities	1,320,849							1,332,338
Cash distributions in unconsolidated real estate ventures	(76,097)							(75,319)
PRISA Self Storage LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property							85
Equity Ownership %						4.00%
Excess Profit %						4.00%
Investment balance	8,640							8,967
HF1 Sovran HHF Storage Holdings LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property							37
Equity Ownership %						49.00%
Investment balance	302,982							304,526
HF1 Sovran HHF Storage Holdings LLC | Minimum
Schedule of Equity Method Investments [Line Items]
Excess Profit %						49.00%
HF1 Sovran HHF Storage Holdings LLC | Maximum
Schedule of Equity Method Investments [Line Items]
Excess Profit %						59.00%
Storage Portfolio II JV LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property							36
Equity Ownership %						10.00%
Excess Profit %						30.00%
Investment balance	(9,777)							(9,584)
Storage Portfolio IV JV LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property							32
Equity Ownership %						10.00%
Excess Profit %						30.00%
Investment balance	46,832							47,150
Storage Portfolio I LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property							24
Equity Ownership %						34.00%
Excess Profit %						49.00%
Investment balance	(43,913)							(43,803)
PR II EXR JV LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores					6		0
Equity Ownership %						25.00%
Excess Profit %						25.00%
Investment balance	$ 0							105,909
Number of properties exchanged | store					17
Number of stores in portfolio | store					23
Ownership percentage after transaction	100.00%
PR II EXR JV LLC | Partner
Schedule of Equity Method Investments [Line Items]
Number of Stores | store					17
Number of properties exchanged | store					6
HF2 Sovran HHF Storage Holdings II LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property							22
Equity Ownership %						49.00%
Investment balance	$ 113,180							114,034
HF2 Sovran HHF Storage Holdings II LLC | Minimum
Schedule of Equity Method Investments [Line Items]
Excess Profit %						49.00%
HF2 Sovran HHF Storage Holdings II LLC | Maximum
Schedule of Equity Method Investments [Line Items]
Excess Profit %						59.00%
HF5 Life Storage-HIERS Storage LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property							17
Equity Ownership %						20.00%
Excess Profit %						20.00%
Investment balance	25,047							25,192
HF6 191 V Life Storage Holdings LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property							17
Equity Ownership %						20.00%
Excess Profit %						20.00%
Investment balance	10,532							10,821
ESS-CA TIVS JV LP
Schedule of Equity Method Investments [Line Items]
Number of Stores | property							16
Equity Ownership %						55.00%
Investment balance	27,097							27,217
ESS-CA TIVS JV LP | Minimum
Schedule of Equity Method Investments [Line Items]
Excess Profit %						55.00%
ESS-CA TIVS JV LP | Maximum
Schedule of Equity Method Investments [Line Items]
Excess Profit %						65.00%
VRS Self Storage, LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property							16
Equity Ownership %						45.00%
Excess Profit %						54.00%
Investment balance	(17,913)							(17,557)
HF10 Life Storage HHF Wasatch Holdings LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property							16
Equity Ownership %						20.00%
Excess Profit %						20.00%
Investment balance	18,913							19,295
Other unconsolidated real estate ventures
Schedule of Equity Method Investments [Line Items]
Number of Stores | property							121
Investment balance	313,132							314,852
Other unconsolidated real estate ventures | Minimum
Schedule of Equity Method Investments [Line Items]
Equity Ownership %						10.00%
Other unconsolidated real estate ventures | Maximum
Schedule of Equity Method Investments [Line Items]
Equity Ownership %						50.00%
SmartStop Self Storage REIT, Inc. Preferred Stock
Schedule of Equity Method Investments [Line Items]
Investment balance	200,000			$ 200,000				200,000
Investment, preferred dividend rate				7.00%
Period after which preferred stock dividend is subject to increase				5 years
Investment redemption restriction period				5 years
Strategic Storage Trust VI, Inc. Preferred Stock
Schedule of Equity Method Investments [Line Items]
Investment balance	150,000							150,000
Dividend rate, percentage			8.35%
Dividend rate increase, threshold			5 years
Redemption period			3 years
Investment in shares			$ 150,000
Strategic Storage Growth Trust III, Inc. Preferred Stock
Schedule of Equity Method Investments [Line Items]
Investment balance	$ 100,000							$ 0
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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