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Fixed Assets, Net - Components of Fixed Assets, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]    
Fixed assets, gross $ 637,370 $ 621,806
Less: accumulated depreciation and amortization (447,896) (431,794)
Fixed assets, net 189,474 190,012
Computer and communications equipment    
Property, Plant and Equipment [Line Items]    
Fixed assets, gross 116,455 112,463
Software, including software development costs    
Property, Plant and Equipment [Line Items]    
Fixed assets, gross 411,080 401,040
Leasehold improvements and other fixed assets    
Property, Plant and Equipment [Line Items]    
Fixed assets, gross $ 109,835 $ 108,303