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The Transaction - Summary of Disposed Assets, previously Assets and Liabilities Held for Sale Transferred to GCU (Parenthetical) (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jul. 01, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | ---
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Allowance for doubtful accounts | $ 0 |  | $ 5,907 | $ 6,291 | $ 5,918
Accumulated depreciation on property and equipment | $ 86,362 |  | $ 231,939 |  |
Asset Held For Sale [Member] |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Allowance for doubtful accounts |  | $ 6,093 |  |  |
Accumulated depreciation on property and equipment |  | $ 166,066 |  |  |

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