Quarterly report pursuant to Section 13 or 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
 3 Months Ended 6 Months Ended
Apr. 12, 2022
USD ($)
Jun. 30, 2022
USD ($)
ft²
storage_unit
state
property
Mar. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
ft²
storage_unit
state
property
Schedule of Equity Method Investments [Line Items]        
Number of self storage properties | property   1,076   1,076
Rentable square feet in self storage properties | ft²   69.9   69.9
Number of storage units | storage_unit   549   549
Number of states in which self storage properties are located | state   42   42
Consideration in acquisition transaction | $   $ 114,533 $ 92,935 $ 207,468
2016 Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Consideration in acquisition transaction | $ $ 207,600      
Company contributions | $ $ 51,900      
Unconsolidated properties | Joint venture | 2018 Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Number of self storage properties | property   103   103
Rentable square feet in self storage properties | ft²   7.8   7.8
Number of storage units | storage_unit   64   64
Number of states in which self storage properties are located | state   17   17
Unconsolidated properties | Joint venture | 2016 Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Number of self storage properties | property   81   81
Rentable square feet in self storage properties | ft²   5.6   5.6
Number of storage units | storage_unit   47   47
Number of states in which self storage properties are located | state   13   13