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Fixed Assets, Net - Components of Fixed Assets, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Fixed assets, gross $ 545,154 $ 510,880
Less: accumulated depreciation and amortization (368,755) (327,402)
Fixed assets, net 176,399 183,478
Computer and communications equipment    
Property, Plant and Equipment [Line Items]    
Fixed assets, gross 100,414 95,730
Software, including software development costs    
Property, Plant and Equipment [Line Items]    
Fixed assets, gross 348,830 320,275
Leasehold improvements and other fixed assets    
Property, Plant and Equipment [Line Items]    
Fixed assets, gross $ 95,910 $ 94,875