Goodwill and Other Intangible Assets - Schedule of Reconciliation of Changes in Carrying Value of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025		Dec. 31, 2024
Goodwill And Intangible Assets [Line Items]
Balance, Beginning of year	$ 258,012		$ 241,162
Business acquisition	7,685	[1]	16,850
Balance, End of year	265,697		258,012
CTU [Member]
Goodwill And Intangible Assets [Line Items]
Balance, Beginning of year	130,755		130,755
Balance, End of year	130,755		130,755
AIUS [Member]
Goodwill And Intangible Assets [Line Items]
Balance, Beginning of year	110,407		110,407
Balance, End of year	110,407		110,407
USAHS [Member]
Goodwill And Intangible Assets [Line Items]
Balance, Beginning of year	16,850
Business acquisition	7,685	[1]	16,850
Balance, End of year	$ 24,535		$ 16,850

[1] The positive adjustment for the year ended December 31, 2025 relates to purchase accounting adjustments for the USAHS acquisition finalized during the period.