Quarterly report pursuant to Section 13 or 15(d)

SELF STORAGE PROPERTY ACQUISITIONS - Narrative (Details)

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SELF STORAGE PROPERTY ACQUISITIONS - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 04, 2016
property
Sep. 30, 2016
USD ($)
property
Jun. 30, 2016
property
Mar. 31, 2016
property
Sep. 30, 2015
USD ($)
property
Jun. 30, 2015
property
Mar. 31, 2015
property
Sep. 30, 2016
USD ($)
property
Sep. 30, 2015
USD ($)
Business Acquisition [Line Items]                  
Number of self storage properties acquired | property   34 25 17 15 21 6 76  
Estimated fair value of acquired self storage properties   $ 493,700           $ 493,700  
Recognized fair value allocated to real estate   481,300           481,300  
Revenue from acquired properties since acquisition   11,200           19,400  
Operating income from acquired properties since acquisition   1,300           2,200  
Acquisition costs   $ 1,737     $ 2,874     4,733 $ 4,192
Number of businesses acquired for which pro forma financial information is available | property   32   15 1        
Number of businesses acquired for which pro forma financial information is not available | property   2   2 14        
Subsequent Event [Member] | Subsequent Acquisitions [Member]                  
Business Acquisition [Line Items]                  
Number of self storage properties acquired | property 2                
Leases, Acquired-in-Place [Member]                  
Business Acquisition [Line Items]                  
Recognized fair value allocated to in-place leases   $ 12,400           $ 12,400  
Affiliated Entity [Member] | Participating Regional Operator [Member]                  
Business Acquisition [Line Items]                  
Number of self storage properties acquired | property               21  
Estimated fair value of acquired self storage properties   $ 157,600           $ 157,600