Segment Information - Reconciliation of Segment Gross Contribution to Net Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Costs and expenses:
Cost of services and product development	$ 377,033	$ 334,467
Selling, general and administrative	617,904	487,255
Acquisition and integration charges	2,207	640
Operating income	217,247	225,412
Interest expense and other, net	(2,188)	(10,659)
Less: Provision for income taxes	42,544	50,653
Net income	172,515	164,100
Reportable segments
Costs and expenses:
Operating income	$ 897,515	777,366
Reportable segments | Maximum
Costs and expenses:
Percent of target bonus allocated to segments	100.00%
Corporate and other expenses
Costs and expenses:
Cost of services and product development	$ 11,808	7,795
Selling, general and administrative	617,904	487,255
Depreciation and amortization	48,349	56,264
Acquisition and integration charges	2,207	640
Operating income	$ (680,268)	$ (551,954)