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Related Party Transactions - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jun. 13, 2023
USD ($)
May 02, 2023
USD ($)
shares
Jan. 30, 2023
USD ($)
shares
Dec. 20, 2022
USD ($)
Oct. 25, 2022
Aug. 09, 2022
USD ($)
Jun. 01, 2022
USD ($)
StorageFacility
StorageProperty
Mar. 01, 2022
Dec. 30, 2021
StorageFacility
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
StorageFacility
shares
Jun. 30, 2022
USD ($)
shares
Dec. 31, 2022
USD ($)
Aug. 29, 2022
USD ($)
May 01, 2022
USD ($)
Dec. 31, 2021
USD ($)
Oct. 07, 2021
USD ($)
Mar. 10, 2021
USD ($)
Related Party Transaction [Line Items]                                      
Maximum dealer manager commission fee percentage of proceeds from Primary Offering                       3.00%              
Change in deferred tax liability                       $ (185,138) $ (799,123)            
Number of self storage facilities | StorageFacility                 2     153              
Outstanding principal, plus accrued interest                       $ 12,016,875 86,237,235            
Principal borrowing amount                                   $ 700,000,000  
Other Income                                      
Related Party Transaction [Line Items]                                      
Loss related to equity interest                   $ 300,000   500,000              
Dividend distribution received                   86,000   170,000              
Managed REIT Platform Expenses                                      
Related Party Transaction [Line Items]                                      
Reimbursements payable to SAM under the Administrative Services Agreement                   102,000 $ 80,000 $ 169,000 125,000            
Managed REIT Platform Revenue                                      
Related Party Transaction [Line Items]                                      
Percentage of revenue from tenant protection programs                       0.10%              
Receivables due from related parties                   $ 5,900,000   $ 5,900,000   $ 2,000,000.0          
SSGT II Merger Agreement                                      
Related Party Transaction [Line Items]                                      
Subordinated distribution value                               $ 16,100,000      
Gain resulting from acquisition of unconsolidated affiliates             $ 16,100,000                        
Write-off of carrying value related to intangible asset             1,400,000                        
Change in deferred tax liability             $ 300,000                        
Number of self storage facilities | StorageFacility             10                        
Number of operating self storage property | StorageProperty             1                        
Class A Common stock                                      
Related Party Transaction [Line Items]                                      
Sale commission fees percentage of proceed from Primary Offering                       7.00%              
Class T Common stock                                      
Related Party Transaction [Line Items]                                      
Sale commission fees percentage of proceed from Primary Offering                       2.00%              
Managed REIT                                      
Related Party Transaction [Line Items]                                      
Equity method investment, ownership percentage                   0.10%   0.10%              
TRS subsidiary | Managed REIT Platform Revenue                                      
Related Party Transaction [Line Items]                                      
Percentage of revenue from tenant protection programs                       99.90%              
TRS subsidiary | Managed REIT                                      
Related Party Transaction [Line Items]                                      
Equity method investment, ownership percentage                   99.90%   99.90%              
Pacific Oak Holding Group                                      
Related Party Transaction [Line Items]                                      
Variable interest entity non-voting ownership percentage               10.00%                      
SmartStop Asset Management | Strategic Transfer Agent Services, LLC                                      
Related Party Transaction [Line Items]                                      
Percentage of membership interest                       100.00%              
Transfer Agent Agreement                                      
Related Party Transaction [Line Items]                                      
Transfer agent agreement term                       3 years              
Transfer agent renewal agreement term                       1 year              
Transfer agent agreement termination description                       The initial term of the transfer agent agreement was three years, which term is automatically renewed for one year successive terms, but either party may terminate the transfer agent agreement upon 90 days’ prior written notice. In the event that we terminate the transfer agent agreement, other than for cause, we will pay our transfer agent all amounts that would have otherwise accrued during the remaining term of the transfer agent agreement; provided, however, that when calculating the remaining months in the term for such purposes, such term is deemed to be a 12 month period starting from the date of the most recent annual anniversary date.              
SSGT II Advisor                                      
Related Party Transaction [Line Items]                                      
Monthly asset management fee                       0.1042%              
Monthly asset management fee one twelfth of less than one percentage of average invested assets                       one-twelfth of 1.25%              
SST VI Advisory Agreement                                      
Related Party Transaction [Line Items]                                      
Rate of acquisition fees of purchase price of contract                   1.00%   1.00%              
Monthly asset management fee                       0.0625%              
Reimbursable Costs                       $ 25,000 $ 8,000            
Monthly asset management fee one twelfth of less than one percentage of average invested assets                       one-twelfth of 0.75%              
SST VI Advisory Agreement | Class W                                      
Related Party Transaction [Line Items]                                      
Percentage of offering cost without reimbursement         1.50%             1.00%              
Shares sold in public offering | shares                       38,000 0            
SST VI Advisory Agreement | Pacific Oak Holding Group                                      
Related Party Transaction [Line Items]                                      
Variable interest entity non-voting ownership percentage               10.00%                      
SSGT III Advisory Agreement                                      
Related Party Transaction [Line Items]                                      
Rate of acquisition fees of purchase price of contract                   1.00%   1.00%              
Monthly asset management fee                       0.0625%              
Monthly asset management fee one twelfth of less than one percentage of average invested assets                       one-twelfth of 0.75              
SSGT III Advisory Agreement | Disposition Fee                                      
Related Party Transaction [Line Items]                                      
Rate of disposition fee of contract sales price                   1.50%   1.50%              
SSGT III Advisory Agreement | Disposition Fee | Pacific Oak Holding Group                                      
Related Party Transaction [Line Items]                                      
Rate of disposition fee of contract sales price                   10.00%   10.00%              
Administrative Services Agreement                                      
Related Party Transaction [Line Items]                                      
Receivables due from related parties                           15,000          
Payables to related parties                   $ 33,000   $ 33,000              
Administrative Services Agreement | Managed REIT Platform Expenses                                      
Related Party Transaction [Line Items]                                      
Administrative service fees                   460,000 135,000 $ 500,000 $ 320,000            
SST VI OP                                      
Related Party Transaction [Line Items]                                      
Purchase units of limited partnership interest | shares     600,000                                
Purchase commitment amount     $ 15,000,000                                
Percentage of investment fee due upon closing     1.00%                                
Description of preferred investor distributions     SmartStop, through its subsidiary, received distributions, payable monthly in arrears, at a rate of 7.0% per annum from the date of issuance until the second anniversary of the date of issuance, 8.0% per annum commencing thereafter until the third anniversary of the date of issuance, 9.0% per annum commencing thereafter until the fourth anniversary of the date of issuance, and 10% per annum thereafter, payable monthly.                                
SST VI OP | Other Income                                      
Related Party Transaction [Line Items]                                      
Loss related to equity interest                     200,000   300,000            
Dividend distribution received                     $ 70,000   140,000            
SST VI OP | Series A Convertible Preferred Stock                                      
Related Party Transaction [Line Items]                                      
Preferred stock shares redeemed | shares   600,000                                  
Interest payable   $ 15,100,000                                  
SST VI OP | Up to Second Anniversary                                      
Related Party Transaction [Line Items]                                      
Rate of distributions payable monthly in arrears     7.00%                                
SST VI OP | Up to Third Anniversary                                      
Related Party Transaction [Line Items]                                      
Rate of distributions payable monthly in arrears     8.00%                                
SST VI OP | Up to Fourth Anniversary                                      
Related Party Transaction [Line Items]                                      
Rate of distributions payable monthly in arrears     9.00%                                
SST VI OP | Investment Thereafter                                      
Related Party Transaction [Line Items]                                      
Rate of distributions payable monthly in arrears     10.00%                                
Property Management Agreement                                      
Related Party Transaction [Line Items]                                      
Write-off of carrying value related to intangible asset             $ 600,000                        
Percentage of fee of former external property managers                       6.00%              
Construction management fee                       5.00%              
Cost of construction or capital improvement work                       $ 10,000              
One time fee for former external property managers                       3,750              
Property Management Agreement | Other Income                                      
Related Party Transaction [Line Items]                                      
Change in deferred tax liability                         $ 200,000            
Property Management Agreement | Minimum                                      
Related Party Transaction [Line Items]                                      
Our former external property management fee                       3,000              
SmartStop OP                                      
Related Party Transaction [Line Items]                                      
Investment of preferred investor                             $ 5,000,000.0        
Investment                                     $ 5,000,000.0
SSGT III OP                                      
Related Party Transaction [Line Items]                                      
Outstanding amount                   8,000,000.0   8,000,000.0   17,500,000          
SSGT III OP | Other Income                                      
Related Party Transaction [Line Items]                                      
Loss related to equity interest                   200,000   400,000              
Dividend distribution received                   65,000   119,000              
SST VI                                      
Related Party Transaction [Line Items]                                      
Outstanding principal, plus accrued interest   $ 51,700,000                                  
Principal borrowing amount $ 15,000,000.0                                    
Principal borrowing amount, currently available                   15,000,000.0   $ 15,000,000.0              
Debt instrument, fee percentage 0.25%                                    
Debt instrument, description of variable rate basis SOFR plus 3.0%                                    
Debt instrument, description of variable rate basis, extended SOFR plus 4.0%                                    
SST VI Mezzanine Loan                                      
Related Party Transaction [Line Items]                                      
Commitment Fee Percentage                 1.00%                    
Debt instrument, description of variable rate basis                 LIBOR plus 3.0%                    
SST VI Mezzanine Loan | Minimum                                      
Related Party Transaction [Line Items]                                      
Increased the principal borrowing amount       $ 45,000,000                              
SST VI Mezzanine Loan | Maximum                                      
Related Party Transaction [Line Items]                                      
Debt issued                                 $ 45,000,000    
Increased the principal borrowing amount       $ 55,000,000                              
SST VI Mezzanine Loan | Pacific Oak Holding Group                                      
Related Party Transaction [Line Items]                                      
Debt instrument, description of variable rate basis       SOFR plus 3.0%                              
SST VI Mezzanine Loan | SST VI OP                                      
Related Party Transaction [Line Items]                                      
Line Of Credit Facility Additional Borrowing Capacity                           15,000,000.0          
Outstanding amount                           35,000,000.0          
SSGT III Mezzanine Loan                                      
Related Party Transaction [Line Items]                                      
Number of operating self storage property | StorageFacility                       4              
Debt issued           $ 50,000,000.0                          
Commitment Fee Percentage           1.00%                          
Principal borrowing amount                   $ 9,500,000   $ 9,500,000   $ 17,500,000          
Debt instrument, description of variable rate basis       SOFR plus 3.0%                              
Line of credit facility, current borrowing capacity           $ 42,000,000.0                          
SSGT III Mezzanine Loan | Minimum                                      
Related Party Transaction [Line Items]                                      
Increased the principal borrowing amount       $ 50,000,000                              
SSGT III Mezzanine Loan | Maximum                                      
Related Party Transaction [Line Items]                                      
Increased the principal borrowing amount       $ 77,000,000                              
Upon Achievement Of Certain Financial Conditions | SSGT III Mezzanine Loan                                      
Related Party Transaction [Line Items]                                      
Debt instrument, description of variable rate basis       SOFR plus 4.0%