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STORAGE PROPERTIES - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
STORAGE FACILITIES    
Storage properties $ 8,084,827 $ 7,628,774
Less: Accumulated depreciation (1,638,631) (1,590,588)
Storage properties, net 6,446,196 6,038,186
Land    
STORAGE FACILITIES    
Storage properties 1,703,014 1,645,549
Buildings and improvements    
STORAGE FACILITIES    
Storage properties 6,139,464 5,759,848
Equipment    
STORAGE FACILITIES    
Storage properties 159,410 147,709
Construction in progress    
STORAGE FACILITIES    
Storage properties 40,994 33,723
Right-of-use assets - finance leases    
STORAGE FACILITIES    
Storage properties $ 41,945 $ 41,945