Quarterly report pursuant to Section 13 or 15(d)

SELF STORAGE PROPERTY ACQUISITIONS - Narrative (Details)

v3.5.0.2
SELF STORAGE PROPERTY ACQUISITIONS - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 09, 2016
property
Jun. 30, 2016
USD ($)
property
Mar. 31, 2016
property
Jun. 30, 2015
USD ($)
property
Mar. 31, 2015
property
Jun. 30, 2016
USD ($)
property
Jun. 30, 2015
USD ($)
Business Acquisition [Line Items]              
Number of self storage properties acquired | property   25 17 21 6 42  
Estimated fair value of acquired self storage properties   $ 288,000       $ 288,000  
Recognized fair value allocated to real estate   280,800       280,800  
Revenue from acquired properties since acquisition   7,100       8,200  
Operating income (loss) from acquired properties since acquisition   800       800  
Acquisition costs   1,708   $ 719   2,996 $ 1,318
Number of businesses acquired for which pro forma financial information is available | property     15        
Number of businesses acquired for which pro forma financial information is not available | property     2        
Leases, Acquired-in-Place [Member]              
Business Acquisition [Line Items]              
Recognized fair value allocated to in-place leases   7,200       $ 7,200  
Participating Regional Operator [Member] | Affiliated Entity [Member]              
Business Acquisition [Line Items]              
Number of self storage properties acquired | property           19  
Estimated fair value of acquired self storage properties   $ 150,800       $ 150,800  
Subsequent Event [Member] | Subsequent Acquisitions [Member]              
Business Acquisition [Line Items]              
Number of self storage properties acquired | property 26