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Related Party Transactions (Details) - USD ($) |  | 7 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 11, 2021 | Aug. 02, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Aug. 31, 2016
Related Party Transaction [Line Items] |  |  |  |  |  |
Distributions, net |  | $ 204,929,000 |  | $ 115,543,000 |  |
Stagwell Subsidiary | Development of Advertising Technology |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Expected amount of transaction |  |  |  |  |  | $ 1,844,000
Revenue from related parties |  |  | $ 950,000 | 1,000 |  |
Due from related parties |  |  | 506,000 | 134,000 |  |
Stagwell Subsidiary | Interagency Customer Services Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue from related parties |  |  | 0 | 900,000 |  |
Affiliated Entity | 2018 Arrangement to Perform Marketing Services |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue from related parties |  |  | 243,000 | 522,000 |  |
Due from related parties |  |  | 88,000 | 109,000 |  |
Affiliated Entity | Loan Agreement, Related Party |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Notes receivable related parties |  |  | 3,784,000 | 3,391,000 |  |
Interest income related party |  |  | 307,000 | 249,000 |  |
Affiliated Entity | 2020 Arrangement to Perform Marketing Services |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue from related parties |  |  | 5,146,000 | 4,866,000 |  |
Due from related parties |  |  | 0 | 7,125,000 |  |
Affiliated Entity | Arrangement To Obtain Sales and Management Services |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Due from related parties |  |  | 23,000 |  |  |
Expenses from transactions |  |  | 788,000 |  |  |
Affiliated Entity | June 2021 Arrangement to Perform Marketing Services |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue from related parties |  |  | 4,814,000 |  |  |
Due from related parties |  |  | 4,033,000 |  |  |
Immediate Family Member of Management or Principal Owner | 2018 Arrangement to Perform Marketing Services |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue from related parties |  |  | 1,473,000 | 8,009,000 |  |
Due to related parties |  |  | 569,000 | 3,020,000 |  |
Immediate Family Member of Management or Principal Owner | Arrangement to Provide Polling Services |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Expected amount of transaction |  |  |  |  | $ 772,000 |
Revenue from related parties |  |  | 436,000 |  |  |
Due from related parties |  |  | 70,000 |  |  |
Stagwell Affiliate |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Consideration received | $ 13,000,000 |  |  |  |  |
Stagwell Affiliate | Noncash Investment Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Amounts of transaction |  |  | 12,400,000 | 93,900,000 |  |
Stagwell Affiliate | Cash Investment Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Amounts of transaction |  |  | 1,600,000 | 1,500,000 |  |
Stagwell Affiliate | Beneficial Owner | Arrangement To Perform Campaign Creative Services |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Expected amount of transaction |  |  | 944,000 |  |  |
Revenue from related parties |  |  | 430,000 |  |  |
Due from related parties |  |  | 238,000 |  |  |
Stagwell Affiliate | Beneficial Owner | Arrangement To Provide Strategic Communications Support |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Expected amount of transaction |  |  | 320,000 |  |  |
Revenue from related parties |  |  | 207,000 |  |  |
Due from related parties |  |  | 0 |  |  |
Stagwell Affiliate | Beneficial Owner | Arrangement To Perform Marketing And Website Development Services |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Expected amount of transaction |  |  | 3,396,000 |  |  |
Revenue from related parties |  |  | 3,132,000 |  |  |
Due from related parties |  |  | 3,132,000 |  |  |
Stagwell Media | Affiliated Entity |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Distributions, net |  |  | $ 191,900,000 | $ 108,500,000 |  |

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