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
Jan. 01, 2015
property
Oct. 31, 2015
property
Sep. 30, 2015
USD ($)
property
Jun. 30, 2015
property
Mar. 31, 2015
USD ($)
property
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
property
Sep. 30, 2014
USD ($)
Business Acquisition [Line Items]                
Business combination, noncontrolling interest, fair value | $     $ 8,300   $ 6,800   $ 8,300  
Number of self storage properties acquired 5   15 21 6   42  
Number of Businesses Acquired for which Pro Forma Financial Information is Not Available     14          
Estimated fair value of acquired self storage properties | $     $ 242,700       $ 242,700  
Recognized fair value of real estate acquired | $     236,100       236,100  
Pro forma revenue | $     5,900       10,400  
Pro forma operating income | $     3,700       6,300  
Acquisition costs | $     $ 2,874     $ 3,092 4,192 $ 8,363
Number of Businesses Acquired for which Pro Forma Financial Information is Available     1          
Leases, Acquired-in-Place [Member]                
Business Acquisition [Line Items]                
Recognized fair value of identifiable intangible assets | $     $ 6,600       $ 6,600  
Property Subject to Operating Lease [Member]                
Business Acquisition [Line Items]                
Number of self storage properties acquired             3  
Participating Regional Operator [Member] | Affiliated Entity [Member]                
Business Acquisition [Line Items]                
Number of self storage properties acquired             11  
Estimated fair value of acquired self storage properties | $     71,300       $ 71,300  
Subsequent Event [Member] | Subsequent Acquisitions [Member]                
Business Acquisition [Line Items]                
Number of self storage properties acquired   15            
Number of Businesses Acquired for which Pro Forma Financial Information is Not Available   1            
Number of Businesses Acquired for which Pro Forma Financial Information is Available   14            
Director [Member] | Affiliated Entity [Member]                
Business Acquisition [Line Items]                
Number of self storage properties acquired             13  
Estimated fair value of acquired self storage properties | $     $ 65,300       $ 65,300