Quarterly report pursuant to Section 13 or 15(d)

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Pro Forma Information (Details)

v3.7.0.1
SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Pro Forma Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
property
Mar. 31, 2017
USD ($)
property
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
property
Jun. 30, 2016
USD ($)
Dec. 31, 2016
property
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]            
Number of self storage properties acquired 10 5   15    
Acquisition costs | $ $ 167 $ 1,700 $ 1,708 $ 311 $ 2,996  
Credit Facility [Member] | Line of Credit [Member] | Revolving line of credit [Member]            
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]            
Effective interest rate (percent) 2.62%   1.87% 2.62% 1.87%  
All 2016 Acquisitions [Member]            
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]            
Number of self storage properties acquired           107
Number of businesses acquired for which pro forma financial information is available           100
Number of businesses acquired for which pro forma financial information is not available           7
Pro forma revenue | $     $ 10,000   $ 25,500  
Pro forma net income (loss) | $     $ 1,900   $ 4,900