Quarterly report pursuant to Section 13 or 15(d)

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Narrative (Details)

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SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Narrative (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
property
Jun. 30, 2017
property
Mar. 31, 2017
property
Sep. 30, 2017
USD ($)
property
Business Acquisition [Line Items]        
Number of self storage properties acquired | property 19 10 5 34
Acquisition-related costs capitalized       $ 2.5
Recognized fair value allocated to real estate $ 220.3     $ 220.3
Number of self storage properties sold | property       3
Gross selling price of self storage properties sold 17.8     $ 17.8
Gain on sale of self storage properties       5.7
Customer In-Place Leases [Member]        
Business Acquisition [Line Items]        
Recognized fair value allocated to in-place leases 5.5     $ 5.5
Affiliated Entity [Member] | Participating Regional Operator [Member]        
Business Acquisition [Line Items]        
Number of self storage properties acquired | property       7
Estimated fair value of acquired self storage properties 40.9     $ 40.9
All 2017 Acquisitions [Member]        
Business Acquisition [Line Items]        
Number of self storage properties acquired | property       34
Estimated fair value of acquired self storage properties $ 225.8     $ 225.8