Property and Equipment, Net - Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, cost	$ 669,323	$ 661,718
Accumulated depreciation	(572,900)	(568,315)
Property and equipment, net	96,423	93,403
Computer hardware
Property, Plant and Equipment [Line Items]
Property and equipment, cost	161,382	157,408
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, cost	247,964	246,013
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, cost	94,028	93,144
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, cost	$ 165,949	$ 165,153