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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |
Beginning Balance | $ 351,725 | $ 325,185
Acquired goodwill | 1,303,649 | 23,775
Disposition | (935) |
Foreign currency translation | (1,716) | 2,765
Ending Balance | 1,652,723 | 351,725
Corporate, Non-Segment |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 0 | 0
Acquired goodwill | 0 |
Disposition | 0 |
Foreign currency translation | 0 | 0
Ending Balance | 0 | 0
Integrated Agencies Network | Operating Segments |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 95,164 | 88,094
Acquired goodwill | 1,058,411 | 7,070
Disposition | 0 |
Foreign currency translation | (502) | 0
Ending Balance | 1,153,073 | 95,164
Media Network | Operating Segments |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 180,639 | 177,073
Acquired goodwill | 178,994 | 235
Disposition | 0 |
Foreign currency translation | (1,020) | 3,331
Ending Balance | 358,613 | 180,639
Communication Network | Operating Segments |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 49,533 | 33,258
Acquired goodwill | 66,244 | 16,275
Disposition | 0 |
Foreign currency translation | 0 | 0
Ending Balance | 115,777 | 49,533
All Other | Operating Segments |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 26,389 | 26,760
Acquired goodwill | 0 | 195
Disposition | (935) |
Foreign currency translation | (194) | (566)
Ending Balance | $ 25,260 | $ 26,389

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