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Segment Reporting - Summary Financial Information by Reporting Segment (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
CTU [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Settlement reserve |  |  | $ 18.6
AIUS [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Settlement reserve |  |  | 11.4
CTU [Member] | Hippo |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition date | Sep. 10, 2021 |  |
AIUS [Member] | DigitalCrafts |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition date | Aug. 02, 2021 |  |
AIUS [Member] | Trident University International |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition date | Mar. 02, 2020 | Mar. 02, 2020 |
Corporate and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Significant legal settlements charge |  |  | $ 7.1

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