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Goodwill and Other Intangible Assets - Schedule of Reconciliation of Changes in Carrying Value of Goodwill (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Goodwill And Intangible Assets [Line Items]    
Balance, Beginning of year $ 241,162 $ 243,540
Business acquisition (16,850) (2,378) [1]
Balance, End of year 258,012 241,162
CTU [Member]    
Goodwill And Intangible Assets [Line Items]    
Balance, Beginning of year 130,755 133,133
Business acquisition [1]   (2,378)
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]    
Business acquisition [2] (16,850)  
Balance, End of year [2] $ 16,850  
[1] The negative adjustment for the year ended December 31, 2023 relates to purchase accounting adjustments finalized during the period.
[2] See Note 3 "Business Acquisition" for further details on acquired intangible assets.