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Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 819,917 $ 740,743 $ 683,083
Intangibles :      
Total intangibles 314,285 260,876  
Total goodwill and other intangibles assets 1,134,202 1,001,619  
Accumulated amortization:      
Total accumulated amortization (182,500) (160,836)  
Goodwill and other intangible assets, net 951,702 840,783  
Client lists      
Intangibles :      
Total intangibles 302,822 249,422  
Accumulated amortization:      
Total accumulated amortization (173,286) (152,326)  
Other intangibles      
Intangibles :      
Total intangibles 11,463 11,454  
Accumulated amortization:      
Total accumulated amortization $ (9,214) $ (8,510)