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Noncontrolling and Redeemable Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Noncontrolling Interest [Line Items] |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest |  | $ 5,721 | $ 19,780 | $ 42,142
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest | $ (3,005) | 7,246 | 3,005 | (634)
Income attributable to noncontrolling interests |  | 1,525 | 22,785 | 41,508
Nonredeemable Noncontrolling Interest |  | 17,974 | 445,174 |
Stagwell Global |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest |  | 916 | 2,636 | 3,076
Income attributable to noncontrolling interests |  | (8,162) | 5,641 | 2,442
Nonredeemable Noncontrolling Interest |  | 17,974 | 21,746 |
Stagwell Media |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest |  | (6,637) | 17,144 | 39,066
Income attributable to noncontrolling interests |  | $ 6,637 | 17,144 | $ 39,066
Nonredeemable Noncontrolling Interest |  |  | $ 423,428 |

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