Annual report pursuant to Section 13 and 15(d)

Real Estate Assets - Additional Information (Details)

Real Estate Assets - Additional Information (Details) - Millbrook, NY
12 Months Ended
Dec. 31, 2019
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 As of December 31, 2019, development costs for this project have been capitalized and are reflected in real estate assets, net on the Company’s consolidated balance sheets. Construction of the expansion was completed in the first quarter of 2020.