Goodwill and Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross	$ 1,026,691	$ 1,034,751
Accumulated Amortization	(1,020,051)	(1,015,963)
Total	$ 6,640	$ 18,788
Weighted average remaining amortization period in years (in years)	1 year 6 months	1 year 4 months 24 days
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross	$ 797,854	$ 799,882
Accumulated Amortization	(792,836)	(787,736)
Total	$ 5,018	$ 12,146
Weighted average remaining amortization period in years (in years)	1 year 3 months 18 days	1 year 4 months 24 days
Trademarks and domain names
Finite-Lived Intangible Assets [Line Items]
Gross	$ 223,916	$ 224,423
Accumulated Amortization	(222,487)	(220,886)
Total	$ 1,429	$ 3,537
Weighted average remaining amortization period in years (in years)	2 years 6 months	1 year 10 months 24 days
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross	$ 4,921	$ 10,446
Accumulated Amortization	(4,728)	(7,341)
Total	$ 193	$ 3,105
Weighted average remaining amortization period in years (in years)	1 year	9 months 18 days