v3.26.1
ORGANIZATION AND NATURE OF OPERATIONS (Details)
storage_unit in Thousands, ft² in Millions
 3 Months Ended
Mar. 16, 2026
Unit
property
shares
Mar. 31, 2026
ft²
storage_unit
state
property
metropolitan_statistical_area
Schedule of Equity Method Investments [Line Items]    
Number of top metropolitan statistical areas for focus of operations | metropolitan_statistical_area   100
Number of self storage properties 313 1,061
Number of states in which self storage properties are located | state   37
Total rentable square feet in self storage properties | ft²   69.3
Number of units in real estate property | storage_unit   547
Common Shares    
Schedule of Equity Method Investments [Line Items]    
Conversion of stock, shares issued | shares 0.1400  
Preferred Shares    
Schedule of Equity Method Investments [Line Items]    
Conversion of stock, shares issued | shares 1  
OP Unit    
Schedule of Equity Method Investments [Line Items]    
Conversion of stock, shares issued | shares 0.1400  
Series A-1 Cumulative Redeemable Preferred Unit    
Schedule of Equity Method Investments [Line Items]    
Number of units issued (in units) | Unit 1  
LTIP units    
Schedule of Equity Method Investments [Line Items]    
Number of units issued (in units) | Unit 1  
Consolidated properties    
Schedule of Equity Method Investments [Line Items]    
Number of self storage properties   799
Number of states in which self storage properties are located | state   33
Total rentable square feet in self storage properties | ft²   51.1
Number of storage units | storage_unit   402
Number of self storage properties to be sold   3
Unconsolidated properties | 2018 Joint Venture    
Schedule of Equity Method Investments [Line Items]    
Company's equity interest in unconsolidated real estate ventures (as a percent)   25.00%
Unconsolidated properties | 2016 Joint Venture    
Schedule of Equity Method Investments [Line Items]    
Company's equity interest in unconsolidated real estate ventures (as a percent)   25.00%
Unconsolidated properties | Joint Venture    
Schedule of Equity Method Investments [Line Items]    
Number of self storage properties   262
Number of states in which self storage properties are located | state   24
Total rentable square feet in self storage properties | ft²   18.2
Number of units in real estate property | storage_unit   145
Unconsolidated properties | Joint Venture | 2018 Joint Venture    
Schedule of Equity Method Investments [Line Items]    
Number of self storage properties   104
Number of states in which self storage properties are located | state   17
Total rentable square feet in self storage properties | ft²   7.9
Number of units in real estate property | storage_unit   65
Company's equity interest in unconsolidated real estate ventures (as a percent)   25.00%
Unconsolidated properties | Joint Venture | 2016 Joint Venture    
Schedule of Equity Method Investments [Line Items]    
Number of self storage properties   81
Number of states in which self storage properties are located | state   13
Total rentable square feet in self storage properties | ft²   5.7
Number of units in real estate property   47,000
Company's equity interest in unconsolidated real estate ventures (as a percent)   25.00%