Quarterly report pursuant to Section 13 or 15(d)

Real Estate Assets - Additional Information (Details)

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Real Estate Assets - Additional Information (Details) - ft²
1 Months Ended 9 Months Ended
Jan. 31, 2018
Sep. 30, 2018
Merrillville, IN    
Real Estate Properties [Line Items]    
Expansion completion date   2018-01
Gross square feet of traditional drive-up storage units and all-climate-controlled units 13,300  
Millbrook, NY    
Real Estate Properties [Line Items]    
Gross square feet of traditional drive-up storage units and all-climate-controlled units   16,500
Estimate for expansion relating to construction cost   The planning for the Millbrook, NY expansion is under development and the Company is actively evaluating proposals for its construction. As of September 30, 2018, development costs for these projects have been capitalized while the projects that are under construction and are reflected in real estate assets, net on the Company’s consolidated balance sheet.