ORGANIZATION AND NATURE OF OPERATIONS (Details) storage_unit in Thousands, ft² in Millions	12 Months Ended
	Dec. 31, 2024 ft² state storage_unit 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	1,074
Number of states in which self storage properties are located | state	42
Total rentable square feet in self storage properties | ft²	70.2
Number of units in real estate property | storage_unit	552
2016 Joint Venture
Schedule of Equity Method Investments [Line Items]
Company's equity interest in unconsolidated real estate ventures (percent)	25.00%
2018 Joint Venture
Schedule of Equity Method Investments [Line Items]
Company's equity interest in unconsolidated real estate ventures (percent)	25.00%
Consolidated properties
Schedule of Equity Method Investments [Line Items]
Number of self storage properties	815
Number of states in which self storage properties are located | state	38
Total rentable square feet in self storage properties | ft²	52.2
Number of storage units | storage_unit	409
Unconsolidated properties | Joint Venture
Schedule of Equity Method Investments [Line Items]
Number of self storage properties	259
Number of states in which self storage properties are located | state	24
Total rentable square feet in self storage properties | ft²	18.0
Number of units in real estate property | storage_unit	143
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 (percent)	25.00%
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 (percent)	25.00%