Fixed Assets, Net - Components of Fixed Assets, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Fixed assets, gross	$ 510,880	$ 482,374
Less: accumulated depreciation and amortization	(327,402)	(292,262)
Fixed assets, net	183,478	190,112
Computer and communications equipment
Property, Plant and Equipment [Line Items]
Fixed assets, gross	95,730	96,472
Software, including software development costs
Property, Plant and Equipment [Line Items]
Fixed assets, gross	320,275	280,540
Leasehold improvements and other fixed assets
Property, Plant and Equipment [Line Items]
Fixed assets, gross	$ 94,875	$ 105,362