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Organization - Additional Information (Detail)
$ / shares in Units, ft² in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Mar. 20, 2025
$ / shares
Mar. 12, 2025
$ / shares
Dec. 30, 2021
Storagefacility
Jan. 31, 2014
USD ($)
Jan. 31, 2017
USD ($)
shares
Dec. 31, 2024
ft²
State
StorageUnit
StorageFacility
Property
$ / shares
shares
May 14, 2024
shares
Jan. 15, 2024
$ / shares
Dec. 31, 2023
$ / shares
shares
Nov. 30, 2016
USD ($)
Organization And Nature Of Operations [Line Items]                    
Date of formation of company           Jan. 08, 2013        
Number of self storage facilities     2     161        
Number of states located for self storage facilities | State           19        
Shares issuable pursuant to distribution reinvestment plan | $       $ 95.0            
Stockholders equity reverse stock split one-for-four                  
Description of issuance and rounded up of stockholders equity reverse stock split reverse stock and OP Unit split, every four shares of our common stock and every four OP Units have been automatically changed into one issued and outstanding share of common stock or OP Unit, as applicable, rounded to the nearest 1/1000th share or OP Unit.                  
Common Stock, par value | $ / shares $ 0.001                  
Advisor, SS Toronto REIT Advisors, Inc., and SS Growth Advisor, LLC.                    
Organization And Nature Of Operations [Line Items]                    
Percentage of limited partnership interests           88.00%        
SAM and Affiliates                    
Organization And Nature Of Operations [Line Items]                    
Percentage of Joint venture minority ownership           12.00%        
Distribution Reinvestment Plan                    
Organization And Nature Of Operations [Line Items]                    
Common stock, value authorize | $                   $ 100.9
Description for termination of offering           The DRP Offering may be terminated at any time upon 10 days’ prior written notice to stockholders.        
Primary Offering                    
Organization And Nature Of Operations [Line Items]                    
Initial public offering commenced period description           We commenced our initial public offering in January 2014        
Maximum | Primary Offering                    
Organization And Nature Of Operations [Line Items]                    
Common stock, value authorize | $       $ 1,000.0            
Class A Common stock                    
Organization And Nature Of Operations [Line Items]                    
Additional shares authorised           350,000,000     350,000,000  
Common Stock, par value | $ / shares           $ 0.001     $ 0.001  
Class A Common stock | Subsequent Event                    
Organization And Nature Of Operations [Line Items]                    
Estimated value per common share | $ / shares   $ 58                
Class A Common stock | Distribution Reinvestment Plan                    
Organization And Nature Of Operations [Line Items]                    
Additional shares authorised             1,125,000      
Number of shares issued in offering           2,600,000        
Class A Common stock | Current Distribution Reinvestment Plan                    
Organization And Nature Of Operations [Line Items]                    
Number of shares issued in offering           137,000        
Class A Common stock | Common Stock | Primary Offering                    
Organization And Nature Of Operations [Line Items]                    
Number of shares issued in offering         12,000,000          
Gross proceeds from issuance of common stock | $         $ 493.0          
Class T Common stock                    
Organization And Nature Of Operations [Line Items]                    
Additional shares authorised           350,000,000     350,000,000  
Common Stock, par value | $ / shares           $ 0.001     $ 0.001  
Class T Common stock | Subsequent Event                    
Organization And Nature Of Operations [Line Items]                    
Estimated value per common share | $ / shares   58                
Class T Common stock | Distribution Reinvestment Plan                    
Organization And Nature Of Operations [Line Items]                    
Additional shares authorised             125,000      
Number of shares issued in offering           300,000        
Class T Common stock | Current Distribution Reinvestment Plan                    
Organization And Nature Of Operations [Line Items]                    
Number of shares issued in offering           16,000        
Class T Common stock | Common Stock | Primary Offering                    
Organization And Nature Of Operations [Line Items]                    
Number of shares issued in offering         2,000,000          
Gross proceeds from issuance of common stock | $         $ 73.0          
Class A and Class T Common Stock                    
Organization And Nature Of Operations [Line Items]                    
NAV per share | $ / shares               $ 61    
Class A and Class T Common Stock | Subsequent Event                    
Organization And Nature Of Operations [Line Items]                    
NAV per share | $ / shares   $ 58                
Managed REITS                    
Organization And Nature Of Operations [Line Items]                    
Number of properties owned by Managed REITs which is operated by the company | Property           37        
Number of self storage units | StorageUnit           29,000        
Net rentable area, primarily self storage space | ft²           3.2