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Investments in Unconsolidated Real Estate Entities (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
store
property
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Schedule of Equity Method Investments [Line Items]      
Number of Stores | property 288    
Investment balance $ 410,785   $ 393,744
Amount invested $ 4,321 $ 250  
Number of joint venture stores purchased | store 2    
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 $ 8,746   8,792
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 $ (6,336)   (6,116)
Storage Portfolio IV JV LLC      
Schedule of Equity Method Investments [Line Items]      
Number of Stores | property 29    
Equity Ownership % 10.00%    
Excess Profit % 30.00%    
Investment balance $ 44,156   40,174
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 $ (40,447)   (40,168)
PR II EXR JV LLC      
Schedule of Equity Method Investments [Line Items]      
Number of Stores | property 18    
Equity Ownership % 25.00%    
Excess Profit % 25.00%    
Investment balance $ 70,131   70,403
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 $ 32,582   32,288
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 $ (14,619)   (14,269)
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 $ 11,746   11,796
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 $ (3,104)   (3,029)
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 $ 7,556   7,621
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 $ 2,204   2,628
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 $ 59,172   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 $ 5,562   5,596
Other minority owned stores      
Schedule of Equity Method Investments [Line Items]      
Number of Stores | property 16    
Investment balance $ 33,436   18,635
Other minority owned stores | Minimum      
Schedule of Equity Method Investments [Line Items]      
Equity Ownership % 20.00%    
Excess Profit % 20.00%    
Other minority owned stores | 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
Investment, preferred dividend rate 6.25%    
Period after which preferred stock dividend is subject to increase 5 years    
Investment redemption restriction period 5 years