Quarterly report pursuant to Section 13 or 15(d)

SUBSEQUENT EVENTS (Details)

v3.7.0.1
SUBSEQUENT EVENTS (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2017
USD ($)
property
Jun. 30, 2017
property
Mar. 31, 2017
property
Jun. 30, 2017
property
Subsequent Event [Line Items]        
Number of self storage properties acquired | property   10 5 15
Subsequent Event [Member] | Series of Individually Immaterial Business Acquisitions [Member]        
Subsequent Event [Line Items]        
Number of self storage properties acquired | property 4      
Aggregate purchase price of properties acquired $ 40.9      
Acquisition of properties, liabilities assumed 0.2      
Subsequent Event [Member] | Management [Member] | Due Diligence Costs [Member]        
Subsequent Event [Line Items]        
Due diligence expenses payable to the PROs $ 0.1