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Organization - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Dec. 06, 2022
$ / shares
Jun. 01, 2022
ft²
RealEstateVenture
State
StorageFacility
StorageUnit
shares
Apr. 19, 2022
USD ($)
Dec. 30, 2021
StorageFacility
Oct. 07, 2021
USD ($)
Mar. 17, 2021
USD ($)
ft²
StorageFacility
RealEstateVenture
StorageUnit
shares
Nov. 10, 2020
RealEstateVenture
StorageFacility
State
Jan. 31, 2014
USD ($)
Aug. 02, 2013
USD ($)
Jan. 31, 2017
USD ($)
shares
Dec. 31, 2022
USD ($)
ft²
StorageFacility
RealEstateVenture
StorageUnit
Property
State
shares
Dec. 31, 2021
shares
Nov. 30, 2016
shares
Organization And Nature Of Operations [Line Items]                          
Date of formation of company                     Jan. 08, 2013    
Number of self storage facilities | StorageFacility       2             153    
Number of states located for self storage facilities | State                     19    
Shares issuable pursuant to distribution reinvestment plan               $ 95,000,000.0          
Advisor, SS Toronto REIT Advisors, Inc., and SS Growth Advisor, LLC.                          
Organization And Nature Of Operations [Line Items]                          
Percentage of limited partnership interests                     88.40%    
SAM and Affiliates                          
Organization And Nature Of Operations [Line Items]                          
Percentage of limited partnership interests owned by noncontrolling owners                     11.60%    
Strategic Storage Operating Partnership II, L.P.                          
Organization And Nature Of Operations [Line Items]                          
Date of formation of company                     Jan. 09, 2013    
Advisor purchased a limited partnership interest in Operating Partnership                 $ 200,000        
Initial capital contribution                 $ 1,000        
Distribution Reinvestment Plan                          
Organization And Nature Of Operations [Line Items]                          
Common Stock, shares authorize | shares                         100,900,000
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               $ 1,000,000,000.0          
Key Bank [Member]                          
Organization And Nature Of Operations [Line Items]                          
Outstanding balance on credit facility           $ 500,000,000              
Proceeds from line of credit           451,000,000              
Credit Facility Revolver                          
Organization And Nature Of Operations [Line Items]                          
Credit facility, increased commitment         $ 200,000,000                
Credit facility, aggregate commitment         450,000,000           $ 450,000,000    
Credit Facility Revolver | Key Bank [Member]                          
Organization And Nature Of Operations [Line Items]                          
Outstanding balance on credit facility           250,000,000              
Credit facility, aggregate commitment         700,000,000                
Credit Facility Revolver | Key Bank [Member] | Minimum                          
Organization And Nature Of Operations [Line Items]                          
Credit facility, increased commitment         200,000,000                
Credit Facility Revolver | Key Bank [Member] | Maximum                          
Organization And Nature Of Operations [Line Items]                          
Credit facility, increased commitment         $ 450,000,000                
Credit Facility Term Loan                          
Organization And Nature Of Operations [Line Items]                          
Credit facility, aggregate commitment                     $ 250,000,000    
Credit Facility Term Loan | Key Bank [Member]                          
Organization And Nature Of Operations [Line Items]                          
Outstanding balance on credit facility           $ 250,000,000              
2032 Private Placement Notes                          
Organization And Nature Of Operations [Line Items]                          
Debt instrument, maturity date     Apr. 19, 2032               Apr. 19, 2032 [1]    
Class A Common stock                          
Organization And Nature Of Operations [Line Items]                          
Common Stock, shares authorize | shares                     350,000,000 350,000,000  
Estimated value per common share | $ / shares $ 15.21                        
Class A Common stock | Common Stock                          
Organization And Nature Of Operations [Line Items]                          
Issuance of common stock in connection with SST IV Merger (in shares) | shares                     11,542,062 23,137,540  
Class A Common stock | Common Stock | Distribution Reinvestment Plan                          
Organization And Nature Of Operations [Line Items]                          
Gross proceeds from issuance of common stock                     $ 77,800,000    
Number of common stock issued | shares                     7,200,000    
Class A Common stock | Common Stock | Primary Offering                          
Organization And Nature Of Operations [Line Items]                          
Number of shares issued in offering | shares                   48,000,000      
Gross proceeds from issuance of common stock                   $ 493,000,000      
Class A Common stock | 2032 Private Placement Notes                          
Organization And Nature Of Operations [Line Items]                          
Debt issued     $ 150,000,000                    
Debt Instrument Fixed Rate     4.53%                    
Class T Common stock                          
Organization And Nature Of Operations [Line Items]                          
Common Stock, shares authorize | shares                     350,000,000 350,000,000  
Estimated value per common share | $ / shares $ 15.21                        
Class T Common stock | Common Stock | Distribution Reinvestment Plan                          
Organization And Nature Of Operations [Line Items]                          
Gross proceeds from issuance of common stock                     $ 11,100,000    
Number of common stock issued | shares                     1,000,000.0    
Class T Common stock | Common Stock | Primary Offering                          
Organization And Nature Of Operations [Line Items]                          
Number of shares issued in offering | shares                   7,000,000      
Gross proceeds from issuance of common stock                   $ 73,000,000      
Canada                          
Organization And Nature Of Operations [Line Items]                          
Number of self storage units | RealEstateVenture   7,740                      
SSGT II Merger Agreement                          
Organization And Nature Of Operations [Line Items]                          
Number of self storage facilities | StorageFacility   10                      
Number of states located for self storage facilities | State   7                      
Number of self storage units | StorageUnit   7,740                      
Net rentable area, primarily self storage space | ft²   853,900                      
Percentage of membership interest   50.00%                      
Number of unconsolidated real estate ventures | RealEstateVenture   3                      
Number of operating self storage facilities | Property                     1    
SSGT II Merger Agreement | Class A Common stock                          
Organization And Nature Of Operations [Line Items]                          
Issuance of common stock in connection with SST IV Merger (in shares) | shares   11,500,000                      
Number of shares exchanged in connection with merger | shares   12,700,000                      
SSGT II Merger Agreement | Canada                          
Organization And Nature Of Operations [Line Items]                          
Number of operating self storage facilities | RealEstateVenture                     1    
Number of parcels of land being developed into self storage facilities | RealEstateVenture                     2    
SST IV Merger Agreement                          
Organization And Nature Of Operations [Line Items]                          
Number of self storage facilities | StorageFacility           24              
Number of self storage units | StorageUnit           18,000              
Net rentable area, primarily self storage space | ft²           2,000,000.0              
Percentage of membership interest           50.00%              
Number of operating self storage facilities | Property                     2    
SST IV Merger Agreement | SST IV Common Stock                          
Organization And Nature Of Operations [Line Items]                          
Number of shares exchanged in connection with merger | shares           10,600,000              
SST IV Merger Agreement | Class A Common stock                          
Organization And Nature Of Operations [Line Items]                          
Issuance of common stock in connection with SST IV Merger (in shares) | shares           23,100,000              
SST IV Merger Agreement | Canada                          
Organization And Nature Of Operations [Line Items]                          
Number of self storage facilities | StorageFacility             24            
Number of states located for self storage facilities | State             9            
Number of unconsolidated real estate ventures | RealEstateVenture           6              
Number of operating self storage facilities           3 3       5    
Number of parcels of land being developed into self storage facilities           3 3       1    
Managed REITS                          
Organization And Nature Of Operations [Line Items]                          
Number of properties owned by Managed REITs which is operated by the company | Property                     19    
Number of self storage units | StorageUnit                     14,600    
Net rentable area, primarily self storage space | ft²                     1,800,000    
SmartStop Asset Management                          
Organization And Nature Of Operations [Line Items]                          
Percentage of non-voting equity owned                     15.00%    
SmartStop Asset Management | Investments in Majority-owned Subsidiaries                          
Organization And Nature Of Operations [Line Items]                          
Percentage of non-voting equity owned                     15.00%    
[1] For additional information regarding this loan, see below