Goodwill and Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross	$ 1,037,706	$ 1,044,608
Accumulated amortization	(992,376)	(962,031)
Total	$ 45,330	$ 82,577
Weighted average remaining amortization period in years (in years)	2 years 1 month 6 days	2 years 4 months 24 days
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross	$ 790,947	$ 797,053
Accumulated amortization	(761,033)	(747,197)
Total	$ 29,914	$ 49,856
Weighted average remaining amortization period in years (in years)	2 years	2 years 8 months 12 days
Trademarks and domain names
Finite-Lived Intangible Assets [Line Items]
Gross	$ 221,919	$ 223,582
Accumulated amortization	(209,241)	(193,772)
Total	$ 12,678	$ 29,810
Weighted average remaining amortization period in years (in years)	1 year 4 months 24 days	1 year 10 months 24 days
Patented technologies
Finite-Lived Intangible Assets [Line Items]
Gross	$ 19,600	$ 19,600
Accumulated amortization	(19,600)	(19,600)
Total	$ 0	$ 0
Weighted average remaining amortization period in years (in years)	0 years	0 years
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross	$ 5,240	$ 4,373
Accumulated amortization	(2,502)	(1,462)
Total	$ 2,738	$ 2,911
Weighted average remaining amortization period in years (in years)	2 years 2 months 12 days	2 years 7 months 6 days