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Noncontrolling and Redeemable Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Noncontrolling Interest [Line Items] |  |
Income attributable to noncontrolling interests | $ 14,884 | $ 15,105
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | 15,296 | 18,231
Noncontrolling interests | 508,287 | 39,787
Stagwell Global |  |
Noncontrolling Interest [Line Items] |  |
Income attributable to noncontrolling interests | 6,126 | 0
Noncontrolling interests | 475,373 | 0
Stagwell Media |  |
Noncontrolling Interest [Line Items] |  |
Income attributable to noncontrolling interests | 9,170 | 18,231
Noncontrolling interests | $ 32,914 | $ 39,787

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