Fixed Assets, Net - Schedule of Fixed Assets, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Fixed assets, gross	$ 621,806	$ 562,702
Less: accumulated depreciation and amortization	(431,794)	(384,402)
Fixed assets, net	190,012	178,300
Computer and communications equipment
Property, Plant and Equipment [Line Items]
Fixed assets, gross	112,463	103,621
Software, including software development costs
Property, Plant and Equipment [Line Items]
Fixed assets, gross	401,040	360,047
Leasehold improvements and other fixed assets
Property, Plant and Equipment [Line Items]
Fixed assets, gross	$ 108,303	$ 99,034