Goodwill and Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross	$ 1,045,056	$ 1,044,608
Accumulated amortization	(983,669)	(962,031)
Total	$ 61,387	$ 82,577
Weighted average remaining amortization period in years (in years)	2 years	2 years 4 months 24 days
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross	$ 797,484	$ 797,053
Accumulated amortization	(758,636)	(747,197)
Total	$ 38,848	$ 49,856
Weighted average remaining amortization period in years (in years)	2 years 6 months	2 years 8 months 12 days
Trademarks and domain names
Finite-Lived Intangible Assets [Line Items]
Gross	$ 223,517	$ 223,582
Accumulated amortization	(203,233)	(193,772)
Total	$ 20,284	$ 29,810
Weighted average remaining amortization period in years (in years)	1 year 6 months	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	$ 4,455	$ 4,373
Accumulated amortization	(2,200)	(1,462)
Total	$ 2,255	$ 2,911
Weighted average remaining amortization period in years (in years)	2 years 2 months 12 days	2 years 7 months 6 days