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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | $ 51,694 | $ 39,544
Revenue earned from balances existing |  | (44,005) | (34,201)
Billings during period | [1] | 140,549 | 153,227
Revenue earned for new billings during the period |  | (113,223) | (113,309)
Other adjustments |  | 1,066 | 321
Gross deferred revenue, ending balance |  | 36,081 | 45,582
University Group [Member] | CTU [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 24,250 | 23,933
Revenue earned from balances existing |  | (22,344) | (20,623)
Billings during period | [1] | 97,516 | 93,896
Revenue earned for new billings during the period |  | (74,147) | (73,485)
Other adjustments |  | 626 | 304
Gross deferred revenue, ending balance |  | 25,901 | 24,025
University Group [Member] | AIU [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 27,444 | 15,507
Revenue earned from balances existing |  | (21,661) | (13,540)
Billings during period | [1] | 43,033 | 58,935
Revenue earned for new billings during the period |  | (39,076) | (39,531)
Other adjustments |  | 440 | 44
Gross deferred revenue, ending balance |  | $ 10,180 | 21,415
Corporate and Other [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance | [2] |  | 104
Revenue earned from balances existing | [2] |  | (38)
Billings during period | [1],[2] |  | 396
Revenue earned for new billings during the period | [2] |  | (293)
Other adjustments | [2] |  | (27)
Gross deferred revenue, ending balance | [2] |  | $ 142
[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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