Property and Equipment - Schedule of Cost Basis and Estimated Useful Lives of Property and Equipment (Detail) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Computer hardware and software	[1]	$ 41,844	$ 35,698
Leasehold improvements	[1]	16,454	19,824
Furniture, fixtures and equipment	[1]	10,865	11,417
Building and improvements	[1]	9,163	9,163
Other	[1]	22	22
Construction in progress	[1]	1,808	4,152
Property plant and equipment, Total	[1]	80,156	80,276
Less-accumulated depreciation	[1]	(58,785)	(54,238)
Total property and equipment, net	[1]	$ 21,371	$ 26,038
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration]		us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember
Computer Hardware and Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (in years)		3 years
Furniture, Fixtures and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (in years)		5 years
Furniture, Fixtures and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (in years)		10 years
Building and Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (in years)		15 years
Building and Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (in years)		35 years
Other [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (in years)		5 years
Other [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life (in years)		10 years

[1] Property and equipment which were fully depreciated and no longer in use by the Company were retired during the years ended December 31, 2023 and 2022; therefore, both the cost of the asset and the related accumulated depreciation balances were reduced to zero for these assets.