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The Transaction - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |  |
Loss on transaction |  | $ (770,000) | $ (15,610,000) | $ (1,440,000) | $ (550,000) | $ (562,000) | $ (18,370,000) | $ (562,000) | $ (1,136,000)
Asset impairment | $ 3,037,000 |  |  |  |  |  |  |  |
Grand Canyon University [Member] |  |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |  |
Cash transferred |  |  |  |  |  |  | 34,107,000 |  |
Loss on transaction due to transaction costs |  |  |  |  |  |  | 18,370,000 |  |
Loss on transaction |  |  |  |  |  |  | 5,765,000 |  |
Asset impairment |  |  |  |  |  |  | 3,037,000 |  |
Recognized deferred compensation plan expense for former GCE employees |  | $ 9,568,000 |  |  |  |  | 9,568,000 |  |
Share-based compensation expense |  |  |  |  |  |  | 7,880,000 |  |
Employer tax expense related to share-based compensation |  |  |  |  |  |  | 191,000 |  |
Share-based compensation modification, net of reversals of employee related liabilities |  |  |  |  |  |  | $ 1,502,000 |  |
Grand Canyon University [Member] | Asset Purchase Agreement [Member] |  |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |  |
Purchase price of assets | 870,097,000 |  |  |  |  |  |  |  |
Final purchase price adjustment amount | $ 1.00 |  |  |  |  |  |  |  |
Senior secured note bears interest | 6.00% |  |  |  |  |  |  |  |
Senior secured notes maturity date |  |  |  |  |  |  | Jun. 30, 2025 |  |
Grand Canyon University [Member] | Master Services Agreement [Member] |  |  |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |  |  |
Percentage of tuition and fee revenue used for closing of purchase agreement |  |  |  |  |  |  | 60.00% |  |
Initial maturity period of agreement |  |  |  |  |  |  | 15 years |  |
Early termination period of agreement |  |  |  |  |  |  | 7 years |  |
Percentage of termination fee |  |  |  |  |  |  | 100.00% |  |
Termination fees payment period |  |  |  |  |  |  | 12 years |  |
Percentage of non-renewal fees payment |  |  |  |  |  |  | 50.00% |  |
Non-renewal fees payment period |  |  |  |  |  |  | 12 months |  |

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