Property, Equipment and Software, Net - Schedule of Property, Equipment and Software (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total property, equipment and software	$ 196,393	$ 194,091
Accumulated depreciation and amortization	(98,397)	(97,450)
Total property, equipment and software, net	97,996	96,641
Internally developed software
Property, Plant and Equipment [Line Items]
Total property, equipment and software	96,171	101,953
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property, equipment and software	36,556	35,140
Computer equipment
Property, Plant and Equipment [Line Items]
Total property, equipment and software	29,598	27,030
Purchased software
Property, Plant and Equipment [Line Items]
Total property, equipment and software	22,403	19,004
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property, equipment and software	8,346	8,203
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, equipment and software	3,319	2,761
Software Development - In Progress
Property, Plant and Equipment [Line Items]
Total property, equipment and software	$ 14,700	$ 13,900