Schedule of Summarized Real Estate Secured Debt (Parenthetical) (Detail)
 12 Months Ended
Mar. 17, 2021
USD ($)
Aug. 02, 2020
Dec. 31, 2021
USD ($)
Property
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 20, 2021
Aug. 03, 2020
USD ($)
Debt Instrument [Line Items]              
Net loss on extinguishment of debt | $     $ (2,444,788) $ 0 $ (2,647,633)    
SST IV Merger              
Debt Instrument [Line Items]              
Net loss on extinguishment of debt | $ $ 2,400,000            
Royal Bank of Canada Prime Rate              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate           2.45%  
Interest Rate Cap              
Debt Instrument [Line Items]              
Derivative, notional amount | $             $ 80,000,000
Debt Instrument Maturity Date   Aug. 02, 2021          
Interest Rate Cap | LIBOR              
Debt Instrument [Line Items]              
Effective interest rate cap on derivative instrument             0.50%
Canadian Citi Bank Loan              
Debt Instrument [Line Items]              
Number of properties encumbered     10        
Canadian Citi Bank Loan | Interest Rate Cap              
Debt Instrument [Line Items]              
Effective interest rate cap on derivative instrument     3.00%        
CMBS SASB Loan              
Debt Instrument [Line Items]              
Number of properties encumbered     29        
Secured Loan              
Debt Instrument [Line Items]              
Number of properties encumbered     16        
Secured Loan | Interest Rate Swap              
Debt Instrument [Line Items]              
Derivative, notional amount | $     $ 85,500,000        
Derivative, Fixed Interest Rate     5.10%        
Stoney Creek Loan | Strategic Storage Growth Trust, Inc              
Debt Instrument [Line Items]              
Debt instrument, variable interest rate     1.95%        
Stoney Creek Loan | Strategic Storage Growth Trust, Inc | Minimum              
Debt Instrument [Line Items]              
Debt Instrument Fixed Rate     4.65%        
Fixed Rate Secured Debt | KeyBank CMBS Loan              
Debt Instrument [Line Items]              
Number of properties encumbered     29        
Debt Instrument Maturity Date [1]     Aug. 01, 2026        
Debt Instrument Fixed Rate [1]     3.89%        
Fixed Rate Secured Debt | KeyBank Property Loan              
Debt Instrument [Line Items]              
Number of properties encumbered     5        
Fixed Rate Secured Debt | Midland North Carolina CMBS Loan              
Debt Instrument [Line Items]              
Number of properties encumbered     11        
Debt Instrument Maturity Date [2]     Aug. 01, 2024        
Debt Instrument Fixed Rate [2]     5.31%        
Fixed Rate Secured Debt | CMBS Loan              
Debt Instrument [Line Items]              
Number of properties encumbered     10        
Debt Instrument Maturity Date [3]     Feb. 01, 2029        
Debt Instrument Fixed Rate [3]     5.00%        
[1] This fixed rate loan encumbers 29 properties (Whittier, La Verne, Santa Ana, Upland, La Habra, Monterey Park, Huntington Beach, Chico, Lancaster I, Riverside, Fairfield, Lompoc, Santa Rosa, Federal Heights, Aurora, Littleton, Bloomingdale, Crestwood, Forestville, Warren I, Sterling Heights, Troy, Warren II, Beverly, Everett, Foley, Tampa, Boynton Beach, and Lancaster II) with monthly interest only payments until September 2021, at which time both interest and principal payments became due monthly. The separate assets of these encumbered properties are not available to pay our other debts.
[2] This fixed rate loan encumbers 11 self storage properties (Asheville I, Arden, Asheville II, Hendersonville I, Asheville III, Asheville IV, Asheville V, Asheville VI, Asheville VII, Asheville VIII, and Hendersonville II) with monthly interest only payments until September 2019, at which time both interest and principal payments became due monthly.
[3] This fixed rate loan encumbers 10 properties (Myrtle Beach I, Myrtle Beach II, Port St. Lucie, Plantation, Sonoma, Las Vegas I, Las Vegas II, Las Vegas III, Ft Pierce, Nantucket Island). The separate assets of these encumbered properties are not available to pay our other debts.