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, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross $ 279,777 $ 241,511
Less: Accumulated depreciation and amortization (131,349) (111,083)
Property, equipment, and software, net 148,428 130,428
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 59,179 51,242
Data processing and communications equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 83,922 76,773
Furniture, fixtures, and other equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross 28,752 26,513
Software    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, gross $ 107,924 $ 86,983