Annual report pursuant to Section 13 and 15(d)

Mortgages Payable and Debt Maturities - Summary of Mortgage Payable (Parenthetical) (Detail)

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Mortgages Payable and Debt Maturities - Summary of Mortgage Payable (Parenthetical) (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Facility
4.065% Mortgage Note Due April 1, 2023 [Member]  
Debt Instrument [Line Items]  
Interest rate 4.065%
Mortgage note due date Apr. 01, 2023
Self-storage facilities | Facility 1
Aggregate net book value of property pledged for mortgage note | $ $ 7.1
Effective interest rate 4.31%
5.26% Mortgage Note Due November 1, 2023 [Member]  
Debt Instrument [Line Items]  
Interest rate 5.26%
Mortgage note due date Nov. 01, 2023
Self-storage facilities | Facility 1
Aggregate net book value of property pledged for mortgage note | $ $ 7.7
Effective interest rate 5.58%
4.4625% Mortgage Note Due December 6, 2024 [Member]  
Debt Instrument [Line Items]  
Interest rate 4.4625%
Mortgage note due date Dec. 06, 2024
Self-storage facilities | Facility 3
Aggregate net book value of property pledged for mortgage note | $ $ 54.3
Effective interest rate 3.21%
4.44% Mortgage Note Due July 6, 2025 [Member]  
Debt Instrument [Line Items]  
Interest rate 4.44%
Mortgage note due date Jul. 06, 2025
Self-storage facilities | Facility 1
Aggregate net book value of property pledged for mortgage note | $ $ 13.4
Effective interest rate 4.50%
5.99% Mortgage Note Due May 1, 2026 [Member]  
Debt Instrument [Line Items]  
Interest rate 5.99%
Mortgage note due date May 01, 2026
Self-storage facilities | Facility 1
Aggregate net book value of property pledged for mortgage note | $ $ 6.3
Effective interest rate 6.37%