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Summary of Significant Accounting Policies - Schedule of Computation of Earnings Per Common Share (Details) - USD ($) | 12 Months Ended
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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) | $ 21,669,452 | $ (19,564,718) | $ (51,206,803)
Net (income) loss attributable to noncontrolling interests | (2,847,572) | 2,663,123 | 6,901,931
Net income (loss) attributable to SmartStop Self Storage REIT, Inc. | 18,821,880 | (16,901,595) | (44,304,872)
Less: Distributions to preferred stockholders | (12,500,000) | (12,500,000) | (10,049,522)
Less: Distributions to participating securities | (285,796) | (246,109) | (135,836)
Net income (loss) attributable to common stockholders - basic: | 6,036,084 | (29,647,704) | (54,490,230)
Net income (loss) attributable to common stockholders - diluted: | $ 6,036,084 | $ (29,647,704) | $ (54,490,230)
Average number of common shares outstanding- basic | 91,939,172 | 79,438,374 | 59,616,407
Average number of common shares outstanding- diluted | 92,056,438 | 79,438,374 | 59,616,407
Earnings Per Share, Basic | $ 0.07 | $ (0.37) | $ (0.91)
Earnings Per Share, Diluted | $ 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
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

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