Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 159,405	$ 157,628
Less: accumulated depreciation and amortization	(130,464)	(125,317)
Property and equipment, net	28,941	32,311
Corporate Aircraft and Related Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	48,645	48,645
Computer Equipment And Purchased Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	60,979	60,375
Furniture and Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,920	9,936
Leaseholds Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	29,944	28,755
Internally Developed Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 9,917	$ 9,917