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Fixed Assets, Net - Components of Fixed Assets, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Fixed assets, gross $ 491,248 $ 482,374
Less: accumulated depreciation and amortization (304,792) (292,262)
Fixed assets, net 186,456 190,112
Computer and communications equipment    
Property, Plant and Equipment [Line Items]    
Fixed assets, gross 96,968 96,472
Software, including software development costs    
Property, Plant and Equipment [Line Items]    
Fixed assets, gross 288,338 280,540
Leasehold improvements and other fixed assets    
Property, Plant and Equipment [Line Items]    
Fixed assets, gross $ 105,942 $ 105,362