Goodwill and Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross	$ 1,051,657	$ 1,044,259
Accumulated Amortization	(1,020,336)	(1,009,544)
Total	$ 31,321	$ 34,715
Weighted average remaining amortization period in years (in years)	1 year 7 months 6 days	1 year 9 months 18 days
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross	$ 797,800	$ 796,213
Accumulated Amortization	(777,849)	(771,475)
Total	$ 19,951	$ 24,738
Weighted average remaining amortization period in years (in years)	1 year 8 months 12 days	1 year 9 months 18 days
Trademarks and domain names
Finite-Lived Intangible Assets [Line Items]
Gross	$ 223,905	$ 223,206
Accumulated Amortization	(217,859)	(215,639)
Total	$ 6,046	$ 7,567
Weighted average remaining amortization period in years (in years)	1 year 10 months 24 days	1 year 8 months 12 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	$ 10,352	$ 5,240
Accumulated Amortization	(5,028)	(2,830)
Total	$ 5,324	$ 2,410
Weighted average remaining amortization period in years (in years)	1 year 2 months 12 days	2 years