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Noncontrolling and Redeemable Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Noncontrolling Interest [Line Items] |  |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | $ (248) | $ 10,640 | $ 6,259 | $ 8,654 |
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest | (608) | (47) | 3,622 | 1,519 | $ (3,005)
Income attributable to noncontrolling interests | (856) | 10,593 | (2,637) | 10,173 |
Nonredeemable Noncontrolling Interest | 21,434 |  | 21,434 |  | 445,174
Stagwell Global |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | (248) | 1,208 | 378 | 2,804 |
Income attributable to noncontrolling interests |  | 1,161 | (4,000) | 4,323 |
Nonredeemable Noncontrolling Interest | 21,434 |  | 21,434 |  | 21,746
Stagwell Media |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | 0 | 9,432 | (6,637) | 5,850 |
Income attributable to noncontrolling interests |  | $ 9,432 | 6,637 | $ 5,850 |
Nonredeemable Noncontrolling Interest | $ 0 |  | $ 0 |  | $ 423,428

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