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Summary of Significant Accounting Policies - Schedule of Computation of Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Net income (loss) $ (5,887) $ 11,647 $ 21,669
Net (income) loss attributable to noncontrolling interests 266 (1,893) (2,847)
Net income (loss) attributable to SmartStop Self Storage REIT, Inc. (5,621) 9,754 18,822
Less: Distributions to preferred stockholders (12,758) (12,500) (12,500)
Less: Distributions to participating securities (451) (369) (286)
Net income (loss) attributable to common stockholders for basic computations: (18,830) (3,115) 6,036
Net income (loss) attributable to common stockholders for diluted computations: $ (18,830) $ (3,115) $ 6,036
Earnings Per Share, Basic $ (0.78) $ (0.13) $ 0.26
Earnings Per Share, Diluted $ (0.78) $ (0.13) $ 0.26
Class A and T Common Stock      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Weighted average number of shares outstanding - basic 24,139,414 24,201,985 22,984,794
Weighted average number of shares outstanding - diluted 24,139,414 24,201,985 23,014,111
Earnings Per Share, Basic $ (0.78) $ (0.13) $ 0.26
Earnings Per Share, Diluted $ (0.78) $ (0.13) $ 0.26
Unvested LTIP Units | Class A and T Common Stock      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Equivalent Shares, included in computation of earnings per share as effect of antidilutive 0 0 0
Unvested restricted stock awards | Class A and T Common Stock      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Equivalent Shares, included in computation of earnings per share as effect of antidilutive 0 0 29,317