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Fixed Assets, Net - Components of Fixed Assets, Net (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Fixed assets, gross $ 496,205 $ 482,374
Less: accumulated depreciation and amortization (314,263) (292,262)
Fixed assets, net 181,942 190,112
Computer and communications equipment    
Property, Plant and Equipment [Line Items]    
Fixed assets, gross 97,638 96,472
Software, including software development costs    
Property, Plant and Equipment [Line Items]    
Fixed assets, gross 298,872 280,540
Leasehold improvements and other fixed assets    
Property, Plant and Equipment [Line Items]    
Fixed assets, gross $ 99,695 $ 105,362