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 9 Months Ended
Aug. 29, 2022
USD ($)
property
Apr. 12, 2022
USD ($)
property
Sep. 30, 2022
USD ($)
ft²
state
property
storage_unit
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
ft²
state
property
storage_unit
Schedule of Equity Method Investments [Line Items]            
Number of self storage properties | property     1,100     1,100
Rentable square feet in self storage properties | ft²     71.5     71.5
Number of storage units | storage_unit     562     562
Number of states in which self storage properties are located | state     42     42
Number of properties acquired | property 1 7        
Consideration in acquisition transaction     $ 321,789 $ 114,533 $ 92,935 $ 529,257
2018 Joint Venture            
Schedule of Equity Method Investments [Line Items]            
Consideration in acquisition transaction $ 6,600          
Company contributions $ 1,600          
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     104     104
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