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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Roll Forward]      
Goodwill, Beginning Balance $ 1,498,815 $ 1,566,956 $ 1,652,723
Goodwill, Acquired During Period 75,908 21,077 65,462
Goodwill, Impairment Loss     (116,714)
Disposition (7,699) (98,779)  
Goodwill, Foreign Currency Translation Gain (Loss) (12,156) 7,526 (25,642)
Other (2) (722) 2,035 (8,873)
Goodwill. Ending Balance 1,554,146 1,498,815 1,566,956
Integrated Agencies Network | Operating Segments      
Goodwill [Roll Forward]      
Goodwill, Beginning Balance 881,395 968,394 1,153,073
Goodwill, Acquired During Period 13,845 18,451 3,330
Goodwill, Impairment Loss     (49,840)
Disposition   (98,779)  
Transfer of Goodwill between reporting segments (4,122) (8,517) (111,065)
Goodwill, Foreign Currency Translation Gain (Loss) (6,485) 1,846 (11,422)
Other (2) (731)   (15,682)
Goodwill. Ending Balance 892,146 881,395 968,394
Brand Performance Network | Operating Segments      
Goodwill [Roll Forward]      
Goodwill, Beginning Balance 441,660 433,758 358,613
Goodwill, Acquired During Period 368 2,626 26,176
Goodwill, Impairment Loss     (49,314)
Transfer of Goodwill between reporting segments (4,122)   (111,065)
Goodwill, Foreign Currency Translation Gain (Loss) (4,149) 5,056 (13,467)
Other (2) 9 220 685
Goodwill. Ending Balance 433,766 441,660 433,758
Communications Network | Operating Segments      
Goodwill [Roll Forward]      
Goodwill, Beginning Balance 136,587 127,717 115,777
Goodwill, Acquired During Period 23,520 6,569  
Transfer of Goodwill between reporting segments   (8,517)  
Goodwill, Foreign Currency Translation Gain (Loss) (784) 353 (753)
Other (2) 0   6,124
Goodwill. Ending Balance 159,323 136,587 127,717
All Other | Operating Segments      
Goodwill [Roll Forward]      
Goodwill, Beginning Balance 39,173 37,087 25,260
Goodwill, Acquired During Period 38,175   29,387
Goodwill, Impairment Loss     (17,560)
Disposition (7,699)    
Goodwill, Foreign Currency Translation Gain (Loss) (738) 271  
Other (2)   1,815  
Goodwill. Ending Balance $ 68,911 $ 39,173 $ 37,087