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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Business acquisition, beginning balance |  |  |  |  | $ 13,395
Gross deferred revenue, beginning balance |  | $ 58,022 | $ 56,920 | $ 85,402 | 63,204
Revenue earned from prior balances |  | (49,791) | (48,167) | (70,507) | (63,900)
Billings during period | [1] | 239,765 | 185,807 | 394,110 | 335,499
Revenue earned for new billings during the period |  | (125,013) | (127,332) | (287,128) | (281,993)
Other adjustments |  | (1,516) | 589 | (410) | 1,612
Gross deferred revenue, ending balance |  | 121,467 | 67,817 | 121,467 | 67,817
University Group [Member] | CTU [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Gross deferred revenue, beginning balance |  | 25,136 | 27,986 | 28,522 | 27,845
Revenue earned from prior balances |  | (22,814) | (25,238) | (25,698) | (24,367)
Billings during period | [1] | 155,861 | 99,464 | 257,645 | 202,508
Revenue earned for new billings during the period |  | (78,828) | (74,451) | (181,324) | (178,365)
Other adjustments |  | (1,537) | 331 | (1,327) | 471
Gross deferred revenue, ending balance |  | 77,818 | 28,092 | 77,818 | 28,092
University Group [Member] | AIU [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Business acquisition, beginning balance |  |  |  |  | 13,395
Gross deferred revenue, beginning balance |  | 32,886 | 28,934 | 56,880 | 35,359
Revenue earned from prior balances |  | (26,977) | (22,929) | (44,809) | (39,533)
Billings during period | [1] | 83,904 | 86,343 | 136,465 | 132,991
Revenue earned for new billings during the period |  | (46,185) | (52,881) | (105,804) | (103,628)
Other adjustments |  | 21 | 258 | 917 | 1,141
Gross deferred revenue, ending balance |  | $ 43,649 | $ 39,725 | $ 43,649 | $ 39,725
[1] | Billings during period includes adjustments for prior billings.

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