Document and Entity Information - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Feb. 18, 2026 |
Jun. 30, 2025 |
|
| Document Information [Line Items] | |||
| Document Type | 10-K | ||
| Amendment Flag | false | ||
| Document Period End Date | Dec. 31, 2025 | ||
| Document Fiscal Year Focus | 2025 | ||
| Document Fiscal Period Focus | FY | ||
| Title of 12(b) Security | Common Stock, $0.001 par value | ||
| Trading Symbol | SMA | ||
| Security Exchange Name | NYSE | ||
| 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 | Large Accelerated Filer | ||
| Entity Public Float | $ 2,000,553,000 | ||
| Entity Common Stock, Shares Outstanding | 55,357,177 | ||
| Entity Shell Company | false | ||
| Entity Small Business | false | ||
| Entity Emerging Growth Company | false | ||
| ICFR Auditor Attestation Flag | true | ||
| Entity File Number | 001-42584 | ||
| 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 | 866 | ||
| Local Phone Number | 418-5144 | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Document Financial Statement Error Correction [Flag] | false | ||
| Auditor Name | BDO USA, P.C. | ||
| Auditor Location | Costa Mesa, California | ||
| Auditor Firm ID | 243 | ||
| 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 2026 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. |
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| Auditor Opinion [Text Block] | Opinion on the Consolidated Financial Statements We have audited the accompanying consolidated balance sheets of SmartStop Self Storage REIT, Inc. (the “Company”) as of December 31, 2025 and 2024, the related consolidated statements of operations, comprehensive income (loss), equity and temporary equity, and cash flows for each of the three years in the period ended December 31, 2025, and the related notes and financial statement schedule listed in the accompanying index (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2025 and 2024, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2025, in conformity with accounting principles generally accepted in the United States of America. We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company's internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) and our report dated February 27, 2026 expressed an unqualified opinion thereon. |