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Summary of Significant Accounting Policies - Schedule of Computation of Earnings Per Common Share (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]              
Net income (loss) $ 2,978,726 $ 2,246,524 $ 9,290,680 $ 19,529,105 $ 21,669,452 $ (19,564,718) $ (51,206,803)
Net (income) loss attributable to noncontrolling interests (463,844) (366,047) (1,573,727) (2,528,010) (2,847,572) 2,663,123 6,901,931
Net income attributable to SmartStop Self Storage REIT, Inc. 2,514,882 1,880,477 7,716,953 17,001,095 18,821,880 (16,901,595) (44,304,872)
Less: Distributions to preferred stockholders (3,150,685) (3,150,684) (9,349,315) (9,349,315) (12,500,000) (12,500,000) (10,049,522)
Less: Distributions to participating securities (92,813) (72,260) (276,041) (213,535) (285,796) (246,109) (135,836)
Net income (loss) attributable to common stockholders for basic computations: (728,616) (1,342,467) (1,908,403) 7,438,245 6,036,084 (29,647,704) (54,490,230)
Net income (loss) attributable to common stockholders for diluted computations: $ (728,616) $ (1,342,467) $ (1,908,403) $ 7,438,245 $ 6,036,084 $ (29,647,704) $ (54,490,230)
Average number of Class A and Class T shares outstanding- basic         91,939,172 79,438,374 59,616,407
Average number of Class A and Class T shares outstanding- diluted         92,056,438 79,438,374 59,616,407
Earnings Per Share, Basic $ (0.01) $ (0.01) $ (0.02) $ 0.08 $ 0.07 $ (0.37) $ (0.91)
Earnings Per Share, Diluted $ (0.01) $ (0.01) $ (0.02) $ 0.08 0.07 (0.37) (0.91)
Class A and T Common stock              
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]              
Average number of Class A and Class T shares outstanding- basic 96,837,584 96,786,669 96,824,500 90,305,337      
Average number of Class A and Class T shares outstanding- diluted 96,837,584 96,786,669 96,824,500 90,425,665      
Earnings Per Share, Basic $ (0.01) $ (0.01) $ (0.02) $ 0.08 0.07 (0.37) (0.91)
Earnings Per Share, Diluted $ (0.01) $ (0.01) $ (0.02) $ 0.08 $ 0.07 $ (0.37) $ (0.91)
Unvested LTIP Units              
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 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 0      
Restricted Stock Awards              
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         117,266 0 0
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 0 120,328