Annual report pursuant to Section 13 and 15(d)

Property, Equipment and Software - Components of Property, Equipment and Software (Detail)

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Property, Equipment and Software - Components of Property, Equipment and Software (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross $ 296,683 $ 279,777
Less: Accumulated depreciation and amortization (143,155) (131,349)
Property, equipment, and software, net 153,528 148,428
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross 63,391 59,179
Data processing and communications equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross 68,015 83,922
Furniture, fixtures, and other equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross 33,840 28,752
Software    
Property, Plant and Equipment [Line Items]    
Property, equipment, and software, gross $ 131,437 $ 107,924