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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | $ 1,566,956 | $ 1,652,723 | $ 351,725
Goodwill, Acquired During Period | 21,077 | 65,462 | 1,303,649
Goodwill, Impairment Loss |  | (116,714) |
Disposition | (98,779) |  | (935)
Goodwill, Foreign Currency Translation Gain (Loss) | 7,526 | (25,642) | (1,716)
Other (2) | 2,035 | (8,873) |
Goodwill. Ending Balance | 1,498,815 | 1,566,956 | 1,652,723
Integrated Agencies Network | Operating Segments |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | 968,394 | 1,153,073 | 95,164
Goodwill, Acquired During Period | 18,451 | 3,330 | 1,058,411
Goodwill, Impairment Loss |  | (49,840) |
Disposition | (98,779) |  |
Transfer of Goodwill between reporting segments | (8,517) | (111,065) |
Goodwill, Foreign Currency Translation Gain (Loss) | 1,846 | (11,422) | (502)
Other (2) |  | (15,682) |
Goodwill. Ending Balance | 881,395 | 968,394 | 1,153,073
Brand Performance Network | Operating Segments |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | 433,758 | 358,613 | 180,639
Goodwill, Acquired During Period | 2,626 | 26,176 | 178,994
Goodwill, Impairment Loss |  | (49,314) |
Transfer of Goodwill between reporting segments |  | 111,065 |
Goodwill, Foreign Currency Translation Gain (Loss) | 5,056 | (13,467) | (1,020)
Other (2) | 220 | 685 |
Goodwill. Ending Balance | 441,660 | 433,758 | 358,613
Communications Network | Operating Segments |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | 127,717 | 115,777 | 49,533
Goodwill, Acquired During Period |  | 6,569 | 66,244
Transfer of Goodwill between reporting segments | 8,517 |  |
Goodwill, Foreign Currency Translation Gain (Loss) | 353 | (753) |
Other (2) |  | 6,124 |
Goodwill. Ending Balance | 136,587 | 127,717 | 115,777
All Other | Operating Segments |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | 37,087 | 25,260 | 26,389
Goodwill, Acquired During Period |  | 29,387 |
Goodwill, Impairment Loss |  | (17,560) |
Disposition |  |  | (935)
Goodwill, Foreign Currency Translation Gain (Loss) | 271 |  | (194)
Other (2) | 1,815 |  |
Goodwill. Ending Balance | $ 39,173 | $ 37,087 | $ 25,260

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