Fixed Assets, Net - Schedule of Components of Fixed Assets, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Property, Plant and Equipment
Total, cost	$ 373,877	$ 360,161
Accumulated depreciation and amortization	(214,611)	(193,432)
Total, net	159,266	166,729
Leasehold improvements, furniture and fixtures, and other fixed assets
Property, Plant and Equipment
Total, cost	261,464	254,337
Software, including software development costs
Property, Plant and Equipment
Total, cost	69,860	64,680
Computer and communications equipment
Property, Plant and Equipment
Total, cost	$ 42,553	$ 41,144