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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | $ 1,652,723 | $ 351,725 | $ 325,185
Acquired goodwill | 65,462 | 1,303,649 | 23,775
Goodwill, Impairment Loss | (116,714) |  |
Disposition |  | (935) |
Transfer of Goodwill between reporting segments | 0 |  |
Foreign currency translation | (25,642) | (1,716) | 2,765
Other (3) | (8,873) |  |
Goodwill. Ending Balance | 1,566,956 | 1,652,723 | 351,725
Integrated Agencies Network | Operating Segments |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | 1,153,073 | 95,164 | 88,094
Acquired goodwill | 3,330 | 1,058,411 | 7,070
Goodwill, Impairment Loss | (49,840) |  |
Transfer of Goodwill between reporting segments | (111,065) |  |
Foreign currency translation | (11,422) | (502) |
Other (3) | (15,682) |  |
Goodwill. Ending Balance | 968,394 | 1,153,073 | 95,164
Brand Performance Network | Operating Segments |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | 358,613 | 180,639 | 177,073
Acquired goodwill | 26,176 | 178,994 | 235
Goodwill, Impairment Loss | (49,314) |  |
Transfer of Goodwill between reporting segments | 111,065 |  |
Foreign currency translation | (13,467) | (1,020) | 3,331
Other (3) | 685 |  |
Goodwill. Ending Balance | 433,758 | 358,613 | 180,639
Communications Network | Operating Segments |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | 115,777 | 49,533 | 33,258
Acquired goodwill | 6,569 | 66,244 | 16,275
Foreign currency translation | (753) |  |
Other (3) | 6,124 |  |
Goodwill. Ending Balance | 127,717 | 115,777 | 49,533
All Other | Operating Segments |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | 25,260 | 26,389 | 26,760
Acquired goodwill | 29,387 |  | 195
Goodwill, Impairment Loss | (17,560) |  |
Disposition |  | (935) |
Foreign currency translation |  | (194) | (566)
Goodwill. Ending Balance | $ 37,087 | $ 25,260 | $ 26,389

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