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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | $ 51,694 | $ 39,544
Revenue earned from balances existing, beginning |  | (44,113) | (36,408)
Billings during period | [1] | 635,826 | 590,851
Revenue earned for new billings during the period |  | (580,943) | (542,137)
Other adjustments |  | 740 | (156)
Gross deferred revenue, ending balance |  | 63,204 | 51,694
University Group [Member] | CTU [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 24,250 | 23,933
Revenue earned from balances existing, beginning |  | (22,289) | (22,218)
Billings during period | [1] | 392,818 | 373,671
Revenue earned for new billings during the period |  | (367,563) | (351,040)
Other adjustments |  | 629 | (96)
Gross deferred revenue, ending balance |  | 27,845 | 24,250
University Group [Member] | AIU [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 27,444 | 15,507
Revenue earned from balances existing, beginning |  | (21,824) | (14,086)
Billings during period | [1] | 243,008 | 216,670
Revenue earned for new billings during the period |  | (213,380) | (190,632)
Other adjustments |  | 111 | (15)
Gross deferred revenue, ending balance |  | $ 35,359 | 27,444
Corporate and Other [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance | [2] |  | 104
Revenue earned from balances existing, beginning | [2] |  | (104)
Billings during period | [1],[2] |  | 510
Revenue earned for new billings during the period | [2] |  | (465)
Other adjustments | [2] |  | $ (45)
[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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