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Fixed Assets, Net - Components of Fixed Assets, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Fixed assets, gross $ 501,756 $ 462,270
Less: accumulated depreciation and amortization (332,157) (305,101)
Fixed assets, net 169,599 157,169
Computer and Communications Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Fixed assets, gross 147,517 140,451
Software, Including Software Development Costs [Member]    
Property, Plant and Equipment [Line Items]    
Fixed assets, gross 212,512 194,470
Leasehold Improvements and Other Fixed Assets [Member]    
Property, Plant and Equipment [Line Items]    
Fixed assets, gross $ 141,727 $ 127,349