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Acquisitions and Dispositions - Narrative (Details) $ / shares in Units, £ in Thousands, shares in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 5 Months Ended | 7 Months Ended | 8 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 03, 2022 USD ($) | Jul. 15, 2022 USD ($) | Jul. 12, 2022 USD ($) | May 31, 2022 USD ($) | Apr. 19, 2022 USD ($) | Apr. 01, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 GBP (£) | Dec. 01, 2021 USD ($) | Oct. 01, 2021 USD ($) | Aug. 02, 2021 USD ($) $ / shares shares | Oct. 30, 2020 USD ($) | Aug. 14, 2020 USD ($) | Feb. 14, 2020 USD ($) | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jul. 31, 2023 | Oct. 03, 2022 GBP (£) | Jul. 12, 2022 GBP (£) | Dec. 31, 2021 GBP (£) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 1,652,723,000 |  |  |  |  |  |  |  | $ 1,566,956,000 | $ 1,652,723,000 | $ 1,566,956,000 | $ 1,566,956,000 | $ 1,566,956,000 | $ 1,652,723,000 | $ 351,725,000 |  |  |  |  | $ 325,185,000
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,687,792,000 | 1,469,363,000 | 888,032,000 |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,573,000 | 14,884,000 | 15,105,000 |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,269,000 | 21,036,000 | 56,356,000 |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,842,000 | 35,920,000 | 71,461,000 |  |  |  |  |
Payments for Acquire Businesses, Working Capital Payments | £ |  |  |  |  |  |  |  | £ 9,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,573,000 | 14,884,000 | $ 15,105,000 |  |  |  |  |
Stagwell Media |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash |  |  |  |  |  |  |  |  |  |  | $ 1.80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MDC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  |  |  |  |  |  |  |  |  |  | $ 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  |  |  | 13 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 1,299,374,000 |  |  |  | $ 1,290,347,000 |  |  |  |  | 1,299,374,000 |  |  |  | 1,299,374,000 |  |  |  |  |  |
Business Acquisition, Share Price | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 5.42 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 605,448,000 |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  |  |  |  | $ 429,062,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MDC | Common Class C | Stagwell Media |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions | shares |  |  |  |  |  |  |  |  |  |  | 179,970 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MDC | Common Units | Stagwell OpCo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  |  |  |  |  |  |  |  |  |  | 69.55% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MDC | Common Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MDC | Integrated Agencies Network |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | $ 932,582,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MDC | Brand Performance Network |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | 285,396,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MDC | Communications Network |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | $ 72,369,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodstuff Holdings Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing cash payment | £ |  |  |  |  |  |  |  | 21,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 4,410,000 |  |  |  |  |  |  |  |  | 4,410,000 |  |  |  | 4,410,000 |  |  |  |  |  |
Payment for contingent consideration | £ |  |  |  |  |  |  |  | 8,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Deferred Payments | £ |  |  |  |  |  |  |  | 4,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  | $ 28,188,000 |  |  |  |  |  |  |  |  | $ 28,188,000 |  |  |  | $ 28,188,000 |  |  |  |  |  |
Payment for contingent consideration | £ |  |  |  |  |  |  |  | 8,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Deferred Payments | £ |  |  |  |  |  |  |  | £ 4,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodstuff Holdings Limited | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred acquisition consideration | £ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 22,000 |
Targeted Victory |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  |  |  |  |  |  |  |  |  | 27.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  | $ 73,898,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred acquisition consideration |  |  |  |  |  |  |  |  |  | $ 46,618,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired, Step One |  |  |  |  |  |  |  |  |  | 13.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Redeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  | $ 27,280,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired, Step One |  |  |  |  |  |  |  |  |  | 13.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Redeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  | $ 27,280,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted Victory | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisitions, Percentage of Voting Interests Acquired, Step Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13.30% |  |  |  |
Business Acquisitions, Percentage of Voting Interests Acquired, Step Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13.30% |  |  |  |
Targeted Victory | Common Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Purchase Price Option Sacrificed in Shares, Percentage |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High |  |  |  |  |  |  |  |  |  | $ 135,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Purchase Price Option Sacrificed in Shares, Percentage |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High |  |  |  |  |  |  |  |  |  | $ 135,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  |  |  |  |  |  |  |  | 27.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  |  | $ 8,058,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing cash payment |  |  |  |  |  |  |  |  | 1,581,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred acquisition consideration |  |  |  |  |  |  |  |  | $ 6,477,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Instrument Holdings Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  | 49.00% |  |  |  | 49.00% |  |  |  |  | 49.00% |
Aggregate purchase price |  |  |  |  |  |  | $ 157,072,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing cash payment |  |  |  |  |  |  | 37,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Deferred Acquisition Payment |  |  |  |  |  |  | 82,072,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Deferred Acquisition Payment |  |  |  |  |  |  | 82,072,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Instrument Holdings Inc. | Common Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  |  |  |  |  |  | $ 37,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hello Design |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  | $ 4,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing cash payment |  |  |  |  |  | 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred acquisition consideration |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BNG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  | $ 20,695,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 24,423,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated contingent consideration |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration payable in cash (percent) |  |  |  |  | 67.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration payable in equity (percent) |  |  |  |  | 33.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,544,000 |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 67,000 |  |  |  |  |  |  |  |
TMA Direct |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  |  |  | 87.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  | $ 17,247,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred acquisition consideration |  |  |  | $ 457,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 6,569,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired, Step One |  |  |  | 13.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High |  |  |  | $ 13,330,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,659,000 |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 889,000 |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired, Step One |  |  |  | 13.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High |  |  |  | $ 13,330,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Epicenter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing cash payment | $ 9,864,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred acquisition consideration | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 4,416,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,028,000 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 11,864,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,183,000 |  |  |  |  |  |  |  |  |  |  |
PEP Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  | $ 521,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated contingent consideration | £ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 2,553 |  |
Apollo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  | $ 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Business, First Payment |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Business, Second Payment |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sloane and Company LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,275,000 |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,416,000 |  |  |  |  |  |  |  |  |  |  |  |
Sloane and Company LLC | Stagwell Media |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing cash payment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Kettle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Closing cash payment |  |  |  |  |  |  |  |  |  |  |  |  | 4,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred acquisition consideration |  |  |  |  |  |  |  |  |  |  |  |  | 11,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 1,323,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,402,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Truelogic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  | $ 17,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing cash payment |  |  |  |  |  |  |  |  |  |  |  | 8,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred acquisition consideration |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 6,184,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  |  |  |  |  |  |  |  |  |  | 7,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  |  |  |  |  | $ 17,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maru Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 8 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 24,204,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,786,000 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 25,793,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 23,000 |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,135,000 |  |  |  |  |  |  |  |  |  |  |
Wolfgang |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |
Closing cash payment | $ 3,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 2,451,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,072,000 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 6,160,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 297,000 |  |  |  |  |  |  |  |  |  |  |
Wolfgang | Common Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $ 1,178,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued by the Company (shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 175 |  |  |  |  |  |  |  |  |  |  |

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