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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Gross deferred revenue, beginning balance |  | $ 36,081 | $ 45,582 | $ 51,694 | $ 39,544
Revenue earned from balances existing |  | (32,539) | (40,909) | (44,120) | (36,624)
Billings during period | [1] | 164,792 | 132,757 | 305,341 | 285,984
Revenue earned for new billings during the period |  | (123,240) | (100,435) | (268,887) | (252,230)
Other adjustments |  | 707 | 265 | 1,773 | 586
Gross deferred revenue, ending balance |  | 45,801 | 37,260 | 45,801 | 37,260
University Group [Member] | CTU [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Gross deferred revenue, beginning balance |  | 25,901 | 24,025 | 24,250 | 23,933
Revenue earned from balances existing |  | (23,679) | (22,347) | (22,335) | (22,210)
Billings during period | [1] | 95,424 | 92,201 | 192,940 | 186,097
Revenue earned for new billings during the period |  | (72,277) | (70,290) | (170,112) | (164,535)
Other adjustments |  | 456 | 165 | 1,082 | 469
Gross deferred revenue, ending balance |  | 25,825 | 23,754 | 25,825 | 23,754
University Group [Member] | AIU [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Gross deferred revenue, beginning balance |  | 10,180 | 21,415 | 27,444 | 15,507
Revenue earned from balances existing |  | (8,860) | (18,420) | (21,785) | (14,310)
Billings during period | [1] | 69,368 | 40,457 | 112,401 | 99,392
Revenue earned for new billings during the period |  | (50,963) | (30,108) | (98,775) | (87,289)
Other adjustments |  | 251 | 92 | 691 | 136
Gross deferred revenue, ending balance |  | $ 19,976 | 13,436 | $ 19,976 | 13,436
Corporate and Other [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Gross deferred revenue, beginning balance | [2] |  | 142 |  | 104
Revenue earned from balances existing | [2] |  | (142) |  | (104)
Billings during period | [1],[2] |  | 99 |  | 495
Revenue earned for new billings during the period | [2] |  | (37) |  | (406)
Other adjustments | [2] |  | 8 |  | (19)
Gross deferred revenue, ending balance | [2] |  | $ 70 |  | $ 70
[1] | Billings during period includes adjustments for prior billings.
[2] | Revenue recorded within Corporate and Other relates to closed campuses which are now reported within this category.

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