Real Estate Assets - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 ft²
McCordsville, IN
Real Estate Properties [Line Items]
Gross square feet of traditional drive-up storage units and all-climate-controlled units	13,713
Number of leasable unit	7,300
Millbrook, NY
Real Estate Properties [Line Items]
Gross square feet of traditional drive-up storage units and all-climate-controlled units	11,800