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, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross $ 241,511 $ 181,234
Less: Accumulated depreciation and amortization (111,083) (99,036)
Property, equipment, and software, net 130,428 82,198
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 51,242 26,138
Data processing and communications equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 76,773 67,871
Furniture, fixtures, and other equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 26,513 18,253
Software    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross $ 86,983 $ 68,972