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STORAGE PROPERTIES - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
STORAGE FACILITIES      
Storage properties $ 7,183,494 $ 5,489,754  
Less: Accumulated depreciation (1,085,824) (983,940)  
Storage properties, net (including VIE assets of $149,467 and $119,345, respectively) 6,097,670 4,505,814 $ 3,774,485
Land      
STORAGE FACILITIES      
Storage properties 1,565,463 1,093,503  
Buildings and improvements      
STORAGE FACILITIES      
Storage properties 5,368,383 4,122,995  
Equipment      
STORAGE FACILITIES      
Storage properties 129,531 123,044  
Construction in progress      
STORAGE FACILITIES      
Storage properties 78,221 108,316  
Right-of-use assets - finance leases      
STORAGE FACILITIES      
Storage properties $ 41,896 $ 41,896