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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 7 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 08, 2021 | Oct. 07, 2021 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2023 | Aug. 02, 2021 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 23, 2021
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  | $ 46,359 | $ 3,117 | $ (4,965) | $ (2,869) | $ (7,834) |  | $ (4,717) | $ 41,642 | $ 50,044 | $ 35,920 |
Net Income (Loss) Attributable to Noncontrolling Interest |  |  | (45,073) | (2,464) | 1,771 | 4,258 | 6,029 | $ (39,626) | 3,565 | (41,508) | (30,125) | (14,884) |
Net Income (Loss) Attributable to Parent |  |  | $ 1,286 | $ 653 | $ (3,194) | $ 1,389 | $ (1,805) |  | $ (1,152) | $ 134 | 19,919 | 21,036 |
Net income available to stockholders, diluted |  |  |  |  |  |  |  |  |  |  | $ 35,923 | $ (3,706) |
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average number of common shares outstanding (in shares) |  |  |  |  |  |  |  |  |  | 117,259,000 | 124,262,000 | 90,426,000 |
Diluted weighted average number of common shares outstanding (in shares) |  |  |  |  |  |  |  |  |  | 122,170,000 | 296,596,000 | 90,426,000 |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  | $ 0.01 | $ 0.01 | $ (0.03) | $ 0.01 | $ (0.01) |  | $ (0.01) | $ 0 | $ 0.16 | $ (0.04) |
Diluted (in dollars per share) |  |  | $ 0.00 | $ 0.00 | $ (0.03) | $ 0.00 | $ (0.01) |  | $ (0.01) | $ 0 | $ 0.12 | $ (0.04) |
Antidilutive securities excluded from computation of earnings per share (shares) |  |  |  |  |  |  |  |  |  | 2,900,000 | 2,300,000 |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  | $ 46,359 | $ 3,117 | $ (4,965) | $ (2,869) | $ (7,834) |  | $ (4,717) | $ 41,642 | $ 50,044 | $ 35,920 |
Income attributable to noncontrolling interests |  |  | 45,073 | 2,464 | (1,771) | (4,258) | (6,029) | $ 39,626 | (3,565) | 41,508 | 30,125 | 14,884 |
Net Income (Loss) Attributable to Parent |  |  | $ 1,286 | $ 653 | $ (3,194) | $ 1,389 | $ (1,805) |  | $ (1,152) | $ 134 | $ 19,919 | $ 21,036 |
Weighted Average Number of Shares Outstanding, Basic |  |  |  |  |  |  |  |  |  | 117,259,000 | 124,262,000 | 90,426,000 |
Net income available to stockholders, diluted |  |  |  |  |  |  |  |  |  |  | $ 35,923 | $ (3,706) |
Weighted Average Number of Shares Issued, Basic |  |  |  |  |  |  |  |  |  |  |  | 90,426,000 |
Diluted weighted average number of common shares outstanding (in shares) |  |  |  |  |  |  |  |  |  | 122,170,000 | 296,596,000 | 90,426,000 |
Net loss attributable to Stagwell Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |  | $ (3,706) |
Preference shares, issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000
Stagwell Media |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | $ 39,066 | $ (16,004) |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | (39,066) | 16,004 |  |
Stagwell Global |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | 2,442 | (14,121) |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | $ (2,442) | $ 14,121 |  |
Common Class C |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number diluted shares outstanding adjustment |  |  |  |  |  |  |  |  |  |  | 165,971,000 |  |
Antidilutive securities excluded from computation of earnings per share (shares) |  |  |  |  |  |  |  |  |  | 154,972,000 |  | 179,970,000 |
Stock Appreciation Rights (SARs) |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number diluted shares outstanding adjustment |  |  |  |  |  |  |  |  |  | 421,000 | 1,896,000 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number diluted shares outstanding adjustment |  |  |  |  |  |  |  |  |  | 4,485,000 | 4,467,000 |  |
Common Class A |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number diluted shares outstanding adjustment |  |  |  |  |  |  |  |  |  |  | 296,596,000 |  |
Shares issued in exchange | 20,949,000 | 12,087,000 |  |  |  |  |  |  |  |  |  |  |
Employee Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number diluted shares outstanding adjustment |  |  |  |  |  |  |  |  |  | 5,000 |  |  |
Stock Appreciation Rights and Restricted Awards |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (shares) |  |  |  |  |  |  |  |  |  | 5,127,000 |  | 9,509,000 |
Series 6 Convertible Preferred Shares | Stagwell Agency Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000
Series 8 Preferred Stock | The Goldman Sachs Group, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 73,849,000 |

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