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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
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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

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