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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | $ 63,204 | $ 51,694
Business acquisition, beginning balance |  | 13,395 |
Revenue earned from prior balances |  | (65,581) | (44,113)
Billings during period | [1] | 694,681 | 635,826
Revenue earned for new billings during the period |  | (618,997) | (580,943)
Other adjustments |  | (1,300) | 740
Gross deferred revenue, ending balance |  | 85,402 | 63,204
University Group [Member] | CTU [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 27,845 | 24,250
Revenue earned from prior balances |  | (25,179) | (22,289)
Billings during period | [1] | 404,930 | 392,818
Revenue earned for new billings during the period |  | (378,161) | (367,563)
Other adjustments |  | (913) | 629
Gross deferred revenue, ending balance |  | 28,522 | 27,845
University Group [Member] | AIU [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 35,359 | 27,444
Business acquisition, beginning balance |  | 13,395 |
Revenue earned from prior balances |  | (40,402) | (21,824)
Billings during period | [1] | 289,751 | 243,008
Revenue earned for new billings during the period |  | (240,836) | (213,380)
Other adjustments |  | (387) | 111
Gross deferred revenue, ending balance |  | $ 56,880 | $ 35,359
[1] | Billings during period includes adjustments for prior billings.

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