Annual report pursuant to Section 13 and 15(d)

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Narrative (Details)

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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Narrative (Details)
storage_unit in Thousands, $ in Thousands, ft² in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
ft²
property
state
storage_unit
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]      
Number of self storage properties 1,101    
Total rentable square feet in self storage properties | ft² 71.8    
Number of storage units 564,000    
Number of states in which self storage properties are located | state 42    
Contributions to unconsolidated real estate venture | $ $ 55,044 $ 0 $ 4,382
Joint Venture | 2018 Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Company's equity interest in unconsolidated real estate ventures (percent) 25.00%    
Contributions to unconsolidated real estate venture | $ $ 1,600    
Joint Venture | 2016 Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Contributions to unconsolidated real estate venture | $     $ 51,900
Unconsolidated properties | Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Number of self storage properties 185    
Total rentable square feet in self storage properties | ft² 13.5    
Number of storage units 111,000    
Number of states in which self storage properties are located | state 21    
Unconsolidated properties | Joint Venture | 2018 Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Company's equity interest in unconsolidated real estate ventures (percent) 25.00%    
Number of self storage properties 104    
Total rentable square feet in self storage properties | ft² 7.8    
Number of storage units | storage_unit 64    
Number of states in which self storage properties are located | state 17    
Number of properties acquired 1    
Payments to acquire property | $ $ 6,600    
Unconsolidated properties | Joint Venture | 2016 Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Company's equity interest in unconsolidated real estate ventures (percent) 25.00%    
Number of self storage properties 81    
Total rentable square feet in self storage properties | ft² 5.6    
Number of storage units 47,000    
Number of states in which self storage properties are located | state 13    
Number of properties acquired 7    
Payments to acquire property | $ $ 207,600