Property and Equipment, Net - Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, cost	$ 676,027	$ 661,718
Accumulated depreciation	(572,411)	(568,315)
Property and equipment, net	103,616	93,403
Computer hardware
Property, Plant and Equipment [Line Items]
Property and equipment, cost	168,714	157,408
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, cost	248,496	246,013
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, cost	94,206	93,144
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, cost	$ 164,611	$ 165,153