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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | As of December 31, goodwill was as follows:
| Integrated Agencies Network |  | Brand Performance Network |  | Communications Network |  | All Other |  |  |  | Total
Balance at December 31, 2020 | $ | 95,164 |  |  | $ | 180,639 |  |  | $ | 49,533 |  |  | $ | 26,389 |  |  |  |  | $ | 351,725 |
Acquired goodwill | 1,058,411 |  |  | 178,994 |  |  | 66,244 |  |  | — |  |  |  |  | 1,303,649 |
Disposition | — |  |  | — |  |  | — |  |  | (935) |  |  |  |  | (935) |
Foreign currency translation | (502) |  |  | (1,020) |  |  | — |  |  | (194) |  |  |  |  | (1,716) |
Balance at December 31, 2021 | $ | 1,153,073 |  |  | $ | 358,613 |  |  | $ | 115,777 |  |  | $ | 25,260 |  |  |  |  | $ | 1,652,723 |
Acquired goodwill | 3,330 |  |  | 26,176 |  |  | 6,569 |  |  | 29,387 |  |  |  |  | 65,462 |
Impairment | (49,840) |  |  | (49,314) |  |  | — |  |  | (17,560) |  |  |  |  | (116,714) |
Transfer of goodwill between segments (1) | (111,065) |  |  | 111,065 |  |  | — |  |  | — |  |  |  |  | — |
Foreign currency translation | (11,422) |  |  | (13,467) |  |  | (753) |  |  | — |  |  |  |  | (25,642) |
Other (2) | (15,682) |  |  | 685 |  |  | 6,124 |  |  | — |  |  |  |  | (8,873) |
Balance at December 31, 2022 | $ | 968,394 |  |  | $ | 433,758 |  |  | $ | 127,717 |  |  | $ | 37,087 |  |  |  |  | $ | 1,566,956 |
Acquired goodwill | 18,451 |  |  | 2,626 |  |  | — |  |  | — |  |  |  |  | 21,077 |
Disposition - ConcentricLife | (98,779) |  |  | — |  |  | — |  |  | — |  |  |  |  | (98,779) |
Transfer of goodwill between segments (1) | (8,517) |  |  | — |  |  | 8,517 |  |  | — |  |  |  |  | — |
Foreign currency translation | 1,846 |  |  | 5,056 |  |  | 353 |  |  | 271 |  |  |  |  | 7,526 |
Other (2) | — |  |  | 220 |  |  | — |  |  | 1,815 |  |  |  |  | 2,035 |
Balance at December 31, 2023 | $ | 881,395 |  |  | $ | 441,660 |  |  | $ | 136,587 |  |  | $ | 39,173 |  |  |  |  | $ | 1,498,815 |
Schedule of Intangible Assets and Goodwill | The gross and net amounts of intangible assets other than goodwill as of December 31, are as follows:
Intangible Assets |  | 2023 |  | 2022
Customer relationships, gross |  | $ | 870,987 |  |  | $ | 875,160 |
Accumulated amortization |  | (218,808) |  |  | (150,655) |
Customer relationships, net |  | $ | 652,179 |  |  | $ | 724,505 |
Trade names, gross |  | $ | 188,820 |  |  | $ | 197,037 |
Accumulated amortization |  | (74,141) |  |  | (53,150) |
Trade names, net |  | $ | 114,679 |  |  | $ | 143,887 |
Capitalized software, gross |  | $ | 70,622 |  |  | $ | 42,234 |
Accumulated amortization |  | (30,928) |  |  | (18,591) |
Capitalized software, net |  | $ | 39,694 |  |  | $ | 23,643 |
Developed technology and other, gross |  | $ | 21,583 |  |  | $ | 21,331 |
Accumulated amortization |  | (9,915) |  |  | (5,837) |
Developed technology and other, net |  | $ | 11,668 |  |  | $ | 15,494 |
Total intangible assets, gross |  | $ | 1,152,012 |  |  | $ | 1,135,762 |
Accumulated amortization |  | (333,792) |  |  | (228,233) |
Total intangible assets, net |  | $ | 818,220 |  |  | $ | 907,529 |
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Finite-Lived Intangible Assets Amortization Expense | The estimated amortization expense for the five succeeding years is as follows:
Year |  | Amortization
2024 |  | $ | 106,514 |
2025 |  | 99,091 |
2026 |  | 89,824 |
2027 |  | 79,256 |
2028 |  | 71,734 |
Thereafter |  | 371,801 |

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