Goodwill and Other Intangible Assets - Schedule of Reconciliation of Changes in Carrying Value of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill And Intangible Assets [Line Items]
Balance, Beginning of year	$ 162,579	$ 118,312
Business acquisitions	80,961	44,267
Balance, End of year	243,540	162,579
CTU [Member]
Goodwill And Intangible Assets [Line Items]
Balance, Beginning of year	73,728	45,938
Business acquisitions	59,405	27,790
Balance, End of year	133,133	73,728
AIUS [Member]
Goodwill And Intangible Assets [Line Items]
Balance, Beginning of year	88,851	72,374
Business acquisitions	21,556	16,477
Balance, End of year	$ 110,407	$ 88,851