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Acquisitions and Dispositions - Schedule of Fair Values of Identifiable Assets and Liabilities of Acquisitions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Consideration:      
Purchase price     $ 88,100
Liabilities      
Goodwill arising from acquisitions $ 887,949 $ 2,206,004 2,163,339
2022 Acquisitions      
Consideration:      
Cash 74,206    
Holdbacks 810    
Fair value of contingent consideration 510    
Purchase price 75,526    
Identifiable intangible assets 25,546    
Assets      
Accounts receivable 6,817    
Other assets 3,446    
Identifiable intangible assets 25,546    
Total assets 35,809    
Liabilities      
Accounts payable 7,363    
Deferred tax liabilities and other 8,546    
Total liabilities 15,909    
Redeemable noncontrolling interest 1,987    
Noncontrolling interest 974    
Total identifiable net assets 16,939    
Goodwill arising from acquisitions $ 58,587    
2022 Acquisitions | Client relationships [Member]      
Consideration:      
Weighted Average Useful Life 6 years    
Identifiable intangible assets $ 24,413    
Assets      
Identifiable intangible assets $ 24,413    
2022 Acquisitions | Trade names [Member]      
Consideration:      
Weighted Average Useful Life 5 years    
Identifiable intangible assets $ 1,133    
Assets      
Identifiable intangible assets $ 1,133    
2021 Acquisitions      
Consideration:      
Cash   42,668  
Holdbacks   13,464  
Fair value of contingent consideration   19,832  
Purchase price   75,964  
Identifiable intangible assets   35,571  
Assets      
Accounts receivable   12,677  
Other assets   4,315  
Property and equipment   998  
Identifiable intangible assets   35,571  
Total assets   53,561  
Liabilities      
Total liabilities   21,206  
Redeemable noncontrolling interest   1,793  
Total identifiable net assets   30,562  
Goodwill arising from acquisitions   $ 45,402  
2021 Acquisitions | Client relationships [Member]      
Consideration:      
Weighted Average Useful Life   7 years  
Identifiable intangible assets   $ 27,387  
Assets      
Identifiable intangible assets   $ 27,387  
2021 Acquisitions | Trade names [Member]      
Consideration:      
Weighted Average Useful Life   5 years  
Identifiable intangible assets   $ 5,084  
Assets      
Identifiable intangible assets   $ 5,084  
2021 Acquisitions | Developed technology [Member]      
Consideration:      
Weighted Average Useful Life   7 years  
Identifiable intangible assets   $ 3,100  
Assets      
Identifiable intangible assets   $ 3,100  
2020 Acquisitions      
Consideration:      
Cash     68,057
Holdbacks     5,260
Fair value of contingent consideration     14,766
Purchase price     88,083
Identifiable intangible assets     42,460
Assets      
Accounts receivable     3,542
Other assets     2,936
Property and equipment     321
Identifiable intangible assets     42,460
Total assets     49,259
Liabilities      
Total liabilities     4,569
Total identifiable net assets     44,690
Goodwill arising from acquisitions     $ 43,393
2020 Acquisitions | Client relationships [Member]      
Consideration:      
Weighted Average Useful Life     6 years
Identifiable intangible assets     $ 42,460
Assets      
Identifiable intangible assets     $ 42,460