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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Gross deferred revenue, beginning balance |  | $ 67,485 | $ 121,467 | $ 113,719 | $ 85,402
Business acquisition, beginning balance |  | 2,419 | 5,356 | 2,419 | 5,356
Revenue earned from prior balances |  | (55,140) | (99,501) | (95,493) | (72,203)
Billings during period | [1] | 195,834 | 137,209 | 496,054 | 531,319
Revenue earned for new billings during the period |  | (111,297) | (73,094) | (418,167) | (458,027)
Other adjustments |  | (593) | 650 | 176 | 240
Gross deferred revenue, ending balance |  | 98,708 | 92,087 | 98,708 | 92,087
University Group [Member] | CTU [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Gross deferred revenue, beginning balance |  | 28,857 | 77,818 | 64,674 | 28,522
Business acquisition, beginning balance |  |  | 3,952 |  | 3,952
Revenue earned from prior balances |  | (23,765) | (66,878) | (56,274) | (26,183)
Billings during period | [1] | 142,580 | 90,662 | 318,191 | 348,307
Revenue earned for new billings during the period |  | (72,826) | (37,469) | (252,617) | (285,186)
Other adjustments |  | (1,003) | 951 | (131) | (376)
Gross deferred revenue, ending balance |  | 73,843 | 69,036 | 73,843 | 69,036
University Group [Member] | AIUS [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Gross deferred revenue, beginning balance |  | 38,628 | 43,649 | 49,045 | 56,880
Business acquisition, beginning balance |  | 2,419 | 1,404 | 2,419 | 1,404
Revenue earned from prior balances |  | (31,375) | (32,623) | (39,219) | (46,020)
Billings during period | [1] | 53,254 | 46,547 | 177,863 | 183,012
Revenue earned for new billings during the period |  | (38,471) | (35,625) | (165,550) | (172,841)
Other adjustments |  | 410 | (301) | 307 | 616
Gross deferred revenue, ending balance |  | $ 24,865 | $ 23,051 | $ 24,865 | $ 23,051
[1] | Billings during period includes adjustments for prior billings.

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