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Summary of Significant Accounting Policies - Summary of Revenues Disaggregated by Nature of Transfer of Services (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  |  | $ 613,675 |  |
Scholarships |  |  | (101,176) |  | $ (135,630)
Net Revenues | $ 155,454 | $ 236,209 | 512,499 | $ 667,953 | $ 702,716
Tuition Revenues [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  |  | 522,430 |  |
Ancillary Revenues [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  |  | $ 91,245 |  |

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