ORGANIZATION AND NATURE OF OPERATIONS (Details) storage_unit in Thousands, ft² in Millions		6 Months Ended
	Jul. 01, 2024 shares	Jun. 30, 2024 ft² storage_unit property state 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		1,052
Number of states in which self storage properties are located | state		42
Total rentable square feet in self storage properties | ft²		68.8
Self storage properties		478
Self storage properties, remaining		333
Number of units in real estate property | storage_unit		542
Subsequent Event
Schedule of Equity Method Investments [Line Items]
Redemptions/conversions of units (in shares) | shares	11,906,167
Issuance of preferred shares (in shares) | shares	17,984,787
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%
Consolidated properties
Schedule of Equity Method Investments [Line Items]
Number of self storage properties		811
Number of states in which self storage properties are located | state		38
Total rentable square feet in self storage properties | ft²		52.1
Number of storage units | storage_unit		407
Unconsolidated properties | Joint venture
Schedule of Equity Method Investments [Line Items]
Number of self storage properties		241
Number of states in which self storage properties are located | state		24
Total rentable square feet in self storage properties | ft²		16.7
Number of units in real estate property | storage_unit		135