Investments in Unconsolidated Real Estate Entities - Schedule of Investments in Unconsolidated Real Estate Ventures (Details) $ in Thousands	1 Months Ended
	Oct. 31, 2019 USD ($)	Dec. 31, 2023 USD ($) property	Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of Stores | property		472
Investment balance		$ 1,000,548	$ 515,060
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		$ 9,435	8,596
HF1 Sovran HHF Storage Holdings LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property		37
Equity Ownership %		20.00%
Excess Profit %		20.00%
Investment balance		$ 105,339	0
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		$ (8,314)	(7,200)
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		$ 48,184	49,139
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		$ (42,487)	(41,372)
PR II EXR JV LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property		23
Equity Ownership %		25.00%
Excess Profit %		25.00%
Investment balance		$ 108,160	110,172
HF2 Sovran HHF Storage Holdings II LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property		22
Equity Ownership %		15.00%
Excess Profit %		15.00%
Investment balance		$ 41,613	0
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		$ 26,051	0
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		$ 12,702	0
ESS-CA TIVS JV LP
Schedule of Equity Method Investments [Line Items]
Number of Stores | property		16
Equity Ownership %		55.00%
Investment balance		$ 29,128	30,778
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		$ (16,386)	(15,399)
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		$ 20,019	0
Other unconsolidated real estate ventures
Schedule of Equity Method Investments [Line Items]
Number of Stores | property		131
Investment balance		$ 317,104	180,346
Other unconsolidated real estate ventures | Minimum
Schedule of Equity Method Investments [Line Items]
Equity Ownership %		10.00%
Excess Profit %		10.00%
Other unconsolidated real estate ventures | Maximum
Schedule of Equity Method Investments [Line Items]
Equity Ownership %		50.00%
Excess Profit %		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	6.25%
Period after which preferred stock dividend is subject to increase	5 years
Strategic Storage Trust VI, Inc. Preferred Stock
Schedule of Equity Method Investments [Line Items]
Investment balance		$ 150,000	$ 0