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Revenue Recognition - Schedule of Previously Reported Balances, Adjustment and Current Reported Balances (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Student receivables, net of allowance for doubtful accounts, current | $ 24,992 |  | $ 18,875
Deferred revenue | $ 23,050 | $ 29,560 | $ 22,897
ASC Topic 606 [Member] |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Student receivables, net of allowance for doubtful accounts, current |  | 25,538 |
Deferred revenue |  | 29,560 |
Impact of Modified Retrospective Adoption of ASC 606 [Member] | ASC Topic 606 [Member] |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Student receivables, net of allowance for doubtful accounts, current |  | 6,663 |
Deferred revenue |  | $ 6,663 |

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