Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 865,180	$ 819,917	$ 740,743
Intangibles :
Total intangibles	349,718	314,285
Total goodwill and other intangibles assets	1,214,898	1,134,202
Accumulated amortization:
Total accumulated amortization	(206,294)	(182,500)
Goodwill and other intangible assets, net	1,008,604	951,702
Client lists
Intangibles :
Total intangibles	338,237	302,822
Accumulated amortization:
Total accumulated amortization	(196,412)	(173,286)
Other intangibles
Intangibles :
Total intangibles	11,481	11,463
Accumulated amortization:
Total accumulated amortization	$ (9,882)	$ (9,214)