Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 68,926	$ 67,662
Less accumulated depreciation	(57,131)	(54,859)
Property and equipment, net	11,795	12,803
Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	40,072	39,273
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	5,005	4,871
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 23,849	$ 23,518