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ORGANIZATION AND NATURE OF OPERATIONS (Details)
storage_unit in Thousands, ft² in Millions
 9 Months Ended
Sep. 30, 2025
ft²
state
metropolitan_statistical_area
property
storage_unit
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 1,069
Number of states in which self storage properties are located | state 37
Total rentable square feet in self storage properties | ft² 69.8
Number of units in real estate property | storage_unit 551
Consolidated properties  
Schedule of Equity Method Investments [Line Items]  
Number of self storage properties 807
Number of states in which self storage properties are located | state 33
Total rentable square feet in self storage properties | ft² 51.6
Number of storage units | storage_unit 406
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%