Quarterly report pursuant to Section 13 or 15(d)

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Narrative (Details)

v3.7.0.1
SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
property
Mar. 31, 2017
property
Jun. 30, 2017
USD ($)
property
Business Acquisition [Line Items]      
Number of self storage properties acquired | property 10 5 15
Acquisition-related costs capitalized     $ 0.8
Recognized fair value allocated to real estate $ 99.4   $ 99.4
Number of self storage properties sold | property     3
Gross selling price of self storage properties sold 15.6   $ 15.6
Gain on sale of self storage properties     5.6
Customer In-Place Leases [Member]      
Business Acquisition [Line Items]      
Recognized fair value allocated to in-place leases 2.5   $ 2.5
Affiliated Entity [Member] | Participating Regional Operator [Member]      
Business Acquisition [Line Items]      
Number of self storage properties acquired | property     6
Estimated fair value of acquired self storage properties 33.4   $ 33.4
All 2017 Acquisitions [Member]      
Business Acquisition [Line Items]      
Number of self storage properties acquired | property     15
Estimated fair value of acquired self storage properties $ 101.9   $ 101.9