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SUBSEQUENT EVENTS (Details) - 2015 Acquisitions
$ in Thousands
6 Months Ended
Jul. 01, 2015
USD ($)
property
Jun. 30, 2015
USD ($)
property
Subsequent Events    
Number of self-storage facilities acquired (in properties)   11
Aggregate purchase or sale price | $   $ 92,965
Texas and Maryland Facilities | Subsequent event    
Subsequent Events    
Aggregate purchase or sale price | $ $ 50,400  
Texas and Maryland Facilities | Subsequent event | Texas    
Subsequent Events    
Number of self-storage facilities acquired (in properties) 1  
Texas and Maryland Facilities | Subsequent event | Maryland    
Subsequent Events    
Number of self-storage facilities acquired (in properties) 2