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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 13, 2024
Jun. 30, 2023
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Registrant Name SmartStop Self Storage REIT, Inc.    
Entity Central Index Key 0001585389    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Public Float     $ 0
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Entity File Number 000-55617    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 46-1722812    
Entity Interactive Data Current Yes    
Entity Address, Address Line One 10 Terrace Rd.    
Entity Address, City or Town Ladera Ranch    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 92694    
City Area Code 877    
Local Phone Number 327-3485    
Document Annual Report true    
Document Transition Report false    
Document Financial Statement Error Correction [Flag] false    
Documents Incorporated by Reference

Documents Incorporated by Reference:

The registrant incorporates by reference in Part III (Items 10, 11, 12, 13 and 14) of this Form 10-K portions of its Definitive Proxy Statement for the 2024 Annual Meeting of Stockholders. The registrant’s Definitive Proxy Statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.

    
Auditor Name BDO USA, P.C.    
Auditor Location Costa Mesa, California    
Auditor Firm ID 243    
Class A Common stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   88,777,145  
Class T Common stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   8,115,510