Investments in Unconsolidated Real Estate Entities - Schedule of Investments in Unconsolidated Real Estate Ventures (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2019	Dec. 31, 2022 USD ($) property	Dec. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of Stores | property		318
Investment balance		$ 515,060	$ 393,744
Equity in earnings of 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		$ 8,596	8,792
Equity in earnings of 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		$ (7,200)	(6,116)
Equity in earnings of 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		$ 49,139	40,174
Equity in earnings of 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		$ (41,372)	(40,168)
Equity in earnings of 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		$ 110,172	70,403
Equity in earnings of 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		$ 30,778	32,288
Equity in earnings of 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		$ (15,399)	(14,269)
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		$ 19,137	0
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		$ 11,332	11,796
Equity in earnings of 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		$ (3,382)	(3,029)
Equity in earnings of 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		$ 7,414	7,621
Equity in earnings of 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		$ 2,110	2,628
ESS - BGO Atlanta GA JV LLC
Schedule of Equity Method Investments [Line Items]
Number of Stores | property		7
Equity Ownership %		20.00%
Excess Profit %		35.00%
Investment balance		$ 30,467	0
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		$ 9,517	0
Equity in earnings of 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		$ 58,476	59,393
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		$ 5,467	5,596
Other unconsolidated real estate ventures
Schedule of Equity Method Investments [Line Items]
Number of Stores | property		14
Investment balance		$ 39,808	18,635
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%
Dividend income from SmartStop preferred stock
Schedule of Equity Method Investments [Line Items]
Investment balance		$ 200,000	$ 200,000
Investment, preferred dividend rate	6.25%
Period after which preferred stock dividend is subject to increase		5 years