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Acquisitions and Dispositions - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 2 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 02, 2021 | Oct. 30, 2020 | Aug. 14, 2020 | Feb. 14, 2020 | Sep. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  | $ 39,801 |  |
Goodwill |  |  |  |  | $ 1,619,272 |  | $ 1,619,272 | $ 351,725
Revenue |  |  |  |  |  | $ 10,794 |  |
Stagwell Media |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash | $ 1,800 |  |  |  |  |  |  |
MDC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $ 80,000 |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 13 years |  |  |  |  |  |  |
Goodwill | $ 1,270,081 |  |  |  |  |  |  |
Business Acquisition, Share Price | $ 5.42 |  |  |  |  |  |  |
Revenue |  |  |  |  | $ 241,257 |  |  |
Transaction expenses |  |  |  |  |  |  | $ 15,000 |
MDC | Common Class C | Stagwell Media |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions | 179,970,051 |  |  |  |  |  |  |
MDC | Common Units | Stagwell OpCo |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) | 69.55% |  |  |  |  |  |  |
MDC | Integrated Agencies Network |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 1,041,277 |  |  |  |  |  |  |
MDC | Media Network |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill | 166,658 |  |  |  |  |  |  |
MDC | Communications Network |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 62,146 |  |  |  |  |  |  |
MDC | Trade Names |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |  |  |  |  |  |  |
Sloane and Company LLC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  | $ 24,400 |  |  |  |
Closing cash payment |  |  |  | 700 |  |  |  |
Goodwill |  |  |  | 16,275 |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  |  | 4,800 |  |  |  |
Sloane and Company LLC | Stagwell Media |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Closing cash payment |  |  |  | $ 18,900 |  |  |  |
Kettle |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Aggregate purchase price |  |  | $ 5,400 |  |  |  |  |
Closing cash payment |  |  | 4,900 |  |  |  |  |
Deferred acquisition consideration |  |  | 11,900 |  |  |  |  |
Goodwill |  |  | 1,323 |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  | $ 500 |  |  |  |  |
Truelogic |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Aggregate purchase price |  | $ 17,300 |  |  |  |  |  |
Closing cash payment |  | 8,900 |  |  |  |  |  |
Deferred acquisition consideration |  | 500 |  |  |  |  |  |
Goodwill |  | 6,184 |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  | $ 7,900 |  |  |  |  |  |

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