Quarterly report pursuant to Section 13 or 15(d)

ORGANIZATION AND NATURE OF OPERATIONS (Details)

v3.23.3
ORGANIZATION AND NATURE OF OPERATIONS (Details)
storage_unit in Thousands, ft² in Millions
 9 Months Ended
Sep. 30, 2023
ft²
metropolitan_statistical_area
property
storage_unit
state
Jan. 01, 2023
property
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 1,119  
Number of states in which self storage properties are located | state 42  
Total rentable square feet in self storage properties | ft² 73.0  
Number of storage units | storage_unit 574  
Self storage properties 603  
Self storage properties, remaining 331  
2018 Joint Venture    
Schedule of Equity Method Investments [Line Items]    
Company's equity interest in unconsolidated real estate ventures (percent) 25.00%  
2016 Joint Venture    
Schedule of Equity Method Investments [Line Items]    
Company's equity interest in unconsolidated real estate ventures (percent) 25.00%  
Joint venture    
Schedule of Equity Method Investments [Line Items]    
Number of self storage properties   72
Consolidated properties    
Schedule of Equity Method Investments [Line Items]    
Number of self storage properties 934  
Number of states in which self storage properties are located | state 39  
Total rentable square feet in self storage properties | ft² 59.5  
Number of storage units | storage_unit 463  
Unconsolidated properties | Joint venture    
Schedule of Equity Method Investments [Line Items]    
Number of self storage properties 185  
Number of states in which self storage properties are located | state 21  
Total rentable square feet in self storage properties | ft² 13.5  
Number of storage units | storage_unit 111