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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | $ 85,402 | $ 63,204
Business acquisitions, beginning balance |  | 5,356 | 13,395
Revenue earned from prior balances |  | (74,448) | (65,581)
Billings during period | [1] | 710,889 | 694,681
Revenue earned for new billings during the period |  | (613,967) | (618,997)
Other adjustments |  | 487 | (1,300)
Gross deferred revenue, ending balance |  | 113,719 | 85,402
University Group [Member] | CTU [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 28,522 | 27,845
Business acquisitions, beginning balance |  | 3,952 |
Revenue earned from prior balances |  | (27,857) | (25,179)
Billings during period | [1] | 439,836 | 404,930
Revenue earned for new billings during the period |  | (378,926) | (378,161)
Other adjustments |  | (853) | (913)
Gross deferred revenue, ending balance |  | 64,674 | 28,522
University Group [Member] | AIUS [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 56,880 | 35,359
Business acquisitions, beginning balance |  | 1,404 | 13,395
Revenue earned from prior balances |  | (46,591) | (40,402)
Billings during period | [1] | 271,053 | 289,751
Revenue earned for new billings during the period |  | (235,041) | (240,836)
Other adjustments |  | 1,340 | (387)
Gross deferred revenue, ending balance |  | $ 49,045 | $ 56,880
[1] | Billings during period includes adjustments for prior billings.

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