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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The following table presents the Company’s goodwill as reported on the Consolidated Balance Sheets as of December 31,:
| Integrated Agencies Network |  | Brand Performance Network |  | Communications Network |  | All Other |  | Total
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 | (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 |
Acquired goodwill | 13,845 |  |  | 368 |  |  | 23,520 |  |  | 38,175 |  |  | 75,908 |
Disposition | — |  |  | — |  |  | — |  |  | (7,699) |  |  | (7,699) |
Transfer of goodwill between segments (1) | 4,122 |  |  | (4,122) |  |  | — |  |  | — |  |  | — |
Foreign currency translation | (6,485) |  |  | (4,149) |  |  | (784) |  |  | (738) |  |  | (12,156) |
Other (2) | (731) |  |  | 9 |  |  | — |  |  | — |  |  | (722) |
Balance at December 31, 2024 | $ | 892,146 |  |  | $ | 433,766 |  |  | $ | 159,323 |  |  | $ | 68,911 |  |  | $ | 1,554,146 |
Schedule of Intangible Assets and Goodwill | The following presents the Company’s gross and net amounts of intangible assets other than goodwill as reported on the Consolidated Balance Sheets as of December 31,:
Intangible Assets |  | 2024 |  | 2023
Customer relationships, gross |  | $ | 939,227 |  |  | $ | 870,987 |
Accumulated amortization |  | (293,581) |  |  | (218,808) |
Customer relationships, net |  | $ | 645,646 |  |  | $ | 652,179 |
Trade names, gross |  | $ | 208,549 |  |  | $ | 188,820 |
Accumulated amortization |  | (94,687) |  |  | (74,141) |
Trade names, net |  | $ | 113,862 |  |  | $ | 114,679 |
Capitalized software, gross |  | $ | 104,017 |  |  | $ | 70,622 |
Accumulated amortization |  | (49,597) |  |  | (30,928) |
Capitalized software, net |  | $ | 54,420 |  |  | $ | 39,694 |
Developed technology and other, gross |  | $ | 37,890 |  |  | $ | 21,583 |
Accumulated amortization |  | (15,035) |  |  | (9,915) |
Developed technology and other, net |  | $ | 22,855 |  |  | $ | 11,668 |
Total intangible assets, gross |  | $ | 1,289,683 |  |  | $ | 1,152,012 |
Accumulated amortization |  | (452,900) |  |  | (333,792) |
Total intangible assets, net |  | $ | 836,783 |  |  | $ | 818,220 |
Finite-Lived Intangible Assets Amortization Expense | The estimated amortization expense for the five succeeding years is as follows:
Year |  | Amortization
2025 |  | $ | 119,386 |
2026 |  | 117,048 |
2027 |  | 102,092 |
2028 |  | 87,055 |
2029 |  | 75,999 |
Thereafter |  | 335,203 |
Total |  | $ | 836,783 |

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