Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 67,662	$ 66,589
Less accumulated depreciation	(54,859)	(52,700)
Property and equipment, net	12,803	13,889
Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	39,273	37,435
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,871	5,012
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 23,518	$ 24,142