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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Deferred Revenue Arrangement [Line Items] |  |  |
Business acquisition, beginning balance |  |  | $ 13,395
Gross deferred revenue, beginning balance |  | $ 85,402 | 63,204
Revenue earned from prior balances |  | (68,092) | (56,667)
Billings during period | [1] | 154,345 | 149,692
Revenue earned for new billings during the period |  | (114,739) | (113,727)
Other adjustments |  | 1,106 | 1,023
Gross deferred revenue, ending balance |  | 58,022 | 56,920
University Group [Member] | CTU [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 28,522 | 27,845
Revenue earned from prior balances |  | (25,689) | (25,149)
Billings during period | [1] | 101,784 | 103,044
Revenue earned for new billings during the period |  | (79,691) | (77,894)
Other adjustments |  | 210 | 140
Gross deferred revenue, ending balance |  | 25,136 | 27,986
University Group [Member] | AIU [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Business acquisition, beginning balance |  |  | 13,395
Gross deferred revenue, beginning balance |  | 56,880 | 35,359
Revenue earned from prior balances |  | (42,403) | (31,518)
Billings during period | [1] | 52,561 | 46,648
Revenue earned for new billings during the period |  | (35,048) | (35,833)
Other adjustments |  | 896 | 883
Gross deferred revenue, ending balance |  | $ 32,886 | $ 28,934
[1] | Billings during period includes adjustments for prior billings.

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