Investments in Unconsolidated Real Estate Entities (Details) $ in Thousands	1 Months Ended		6 Months Ended
	May 31, 2023 USD ($)	Oct. 31, 2019 USD ($)	Jun. 30, 2023 USD ($) property store	Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of Stores | property			323
Investment balance			$ 678,592	$ 515,060
Purchase price			$ 20,686
Number of joint venture stores purchased | store			5
PRISA Self Storage LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property			84
Equity Ownership %			4.00%
Excess Profit %			4.00%
Investment balance			$ 8,487	8,596
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			$ (7,628)	(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			$ 48,511	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			$ (42,000)	(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			$ 109,014	110,172
ESS-CA TIVS JV LP
Schedule of Equity Method Investments [Line Items]
Number of Stores | property			16
Equity Ownership %			55.00%
Excess Profit %			60.00%
Investment balance			$ 29,938	30,778
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			$ (15,922)	(15,399)
ESS-NYFL JV LP
Schedule of Equity Method Investments [Line Items]
Number of Stores | property			11
Equity Ownership %			16.00%
Excess Profit %			24.00%
Investment balance			$ 11,031	11,332
Extra Space Northern Properties Six LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property			10
Equity Ownership %			10.00%
Excess Profit %			35.00%
Investment balance			$ (3,633)	(3,382)
Alan Jathoo JV LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property			9
Equity Ownership %			10.00%
Excess Profit %			10.00%
Investment balance			$ 7,313	7,414
ESS Bristol Investments LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property			8
Equity Ownership %			10.00%
Excess Profit %			30.00%
Investment balance			$ 2,017	2,110
ARA-EXR JV LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property			12
Equity Ownership %			10.00%
Excess Profit %			30.00%
Investment balance			$ 18,982	19,137
ESS - BGO Atlanta GA JV LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property			8
Equity Ownership %			20.00%
Excess Profit %			35.00%
Investment balance			$ 35,185	30,467
ESS - BGO Storage JV I LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property			6
Equity Ownership %			20.00%
Excess Profit %			35.00%
Investment balance			$ 22,781	7,466
Storage Portfolio V JV LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property			6
Equity Ownership %			10.00%
Excess Profit %			30.00%
Investment balance			$ 9,416	9,517
PR EXR Self Storage, LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property			5
Equity Ownership %			25.00%
Excess Profit %			40.00%
Investment balance			$ 57,984	58,476
Storage Portfolio III JV LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property			5
Equity Ownership %			10.00%
Excess Profit %			30.00%
Investment balance			$ 5,419	5,467
Other unconsolidated real estate ventures
Schedule of Equity Method Investments [Line Items]
Number of Stores | property			12
Investment balance			$ 31,697	32,342
Other unconsolidated real estate ventures | Minimum
Schedule of Equity Method Investments [Line Items]
Equity Ownership %			20.00%
Excess Profit %			20.00%
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
Investment redemption restriction period		5 years
Strategic Storage Trust VI, Inc. Preferred Stock
Schedule of Equity Method Investments [Line Items]
Investment balance			$ 150,000	$ 0
Investment in shares	$ 150,000
Dividend rate, percentage	8.35%
Dividend rate increase, threshold	5 years
Redemption period	3 years