Goodwill and Other Intangible Assets - Schedule of Reconciliation of Changes in Carrying Value of Goodwill (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Goodwill And Intangible Assets [Line Items]
Balance, Beginning of year		$ 243,540	$ 162,579
Business acquisitions	[1]	(2,378)	(80,961)
Balance, End of year		241,162	243,540
CTU [Member]
Goodwill And Intangible Assets [Line Items]
Balance, Beginning of year		133,133	73,728
Business acquisitions	[1]	(2,378)	(59,405)
Balance, End of year		130,755	133,133
AIUS [Member]
Goodwill And Intangible Assets [Line Items]
Balance, Beginning of year		110,407	88,851
Business acquisitions	[1]		(21,556)
Balance, End of year		$ 110,407	$ 110,407

[1] The negative adjustment for the year ended December 31, 2023 relates to purchase accounting adjustments finalized during the period.