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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | $ 37,260 | $ 39,544
Revenue earned from balances existing |  | (32,921) | (36,606)
Billings during period | [1] | 167,192 | 453,176
Revenue earned for new billings during the period |  | (111,961) | (397,130)
Other adjustments |  | (791) | (205)
Gross deferred revenue, ending balance |  | 58,779 | 58,779
University Group [Member] | CTU [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 23,754 | 23,933
Revenue earned from balances existing |  | (21,533) | (22,192)
Billings during period | [1] | 93,277 | 279,374
Revenue earned for new billings during the period |  | (70,837) | (256,923)
Other adjustments |  | (266) | 203
Gross deferred revenue, ending balance |  | 24,395 | 24,395
University Group [Member] | AIU [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 13,436 | 15,507
Revenue earned from balances existing |  | (11,341) | (14,310)
Billings during period | [1] | 73,852 | 173,244
Revenue earned for new billings during the period |  | (41,106) | (139,736)
Other adjustments |  | (500) | (364)
Gross deferred revenue, ending balance |  | 34,341 | 34,341
All Other Campuses [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 70 | 104
Revenue earned from balances existing |  | (47) | (104)
Billings during period | [1] | 63 | 558
Revenue earned for new billings during the period |  | (18) | (471)
Other adjustments |  | (25) | (44)
Gross deferred revenue, ending balance |  | $ 43 | $ 43
[1] | Billings during period includes adjustments for prior billings.

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- Definition For the current period, the amount of new charges billed to customers for services to be provided for the current academic term. + References No definition available. + Details
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- Definition The amount of other adjustments to the deferred revenue balance during the current period. + References No definition available. + Details
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- Definition The gross amount of deferred revenue before offsetting with any contract asset balances. + References No definition available. + Details
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- Definition Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References No definition available. + Details
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