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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Gross deferred revenue, beginning balance |  | $ 67,817 | $ 45,801 | $ 63,204 | $ 51,694
Business acquisition, beginning balance |  |  |  | 13,395 |
Revenue earned from prior balances |  | (56,271) | (40,345) | (63,280) | (44,068)
Billings during period | [1] | 156,817 | 144,173 | 492,316 | 449,514
Revenue earned for new billings during the period |  | (112,200) | (113,946) | (451,084) | (423,230)
Other adjustments |  | (1,107) | (72) | 505 | 1,701
Gross deferred revenue, ending balance |  | 55,056 | 35,611 | 55,056 | 35,611
University Group [Member] | CTU [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Gross deferred revenue, beginning balance |  | 28,092 | 25,825 | 27,845 | 24,250
Revenue earned from prior balances |  | (25,035) | (23,375) | (24,376) | (22,289)
Billings during period | [1] | 99,219 | 96,863 | 301,727 | 289,803
Revenue earned for new billings during the period |  | (73,411) | (72,054) | (276,802) | (265,587)
Other adjustments |  | (777) | (146) | (306) | 936
Gross deferred revenue, ending balance |  | 28,088 | 27,113 | 28,088 | 27,113
University Group [Member] | AIU [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Gross deferred revenue, beginning balance |  | 39,725 | 19,976 | 35,359 | 27,444
Business acquisition, beginning balance |  |  |  | 13,395 |
Revenue earned from prior balances |  | (31,236) | (16,970) | (38,904) | (21,779)
Billings during period | [1] | 57,598 | 47,310 | 190,589 | 159,711
Revenue earned for new billings during the period |  | (38,789) | (41,892) | (174,282) | (157,643)
Other adjustments |  | (330) | 74 | 811 | 765
Gross deferred revenue, ending balance |  | $ 26,968 | $ 8,498 | $ 26,968 | $ 8,498
[1] | Billings during period includes adjustments for prior billings.

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