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The Transaction - Summary of Disposed Assets, previously Assets and Liabilities Held for Sale Transferred to GCU - Additional Information (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Jul. 01, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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The Transaction |  |  |  |  |
Allowance for doubtful accounts | $ 0 |  |  | $ 7,182 | $ 5,907
Accumulated depreciation on property and equipment | $ 84,194 | $ 89,689 |  |  |
Assets Held for Sale |  |  |  |  |
The Transaction |  |  |  |  |
Allowance for doubtful accounts |  |  | $ 6,093 |  |
Accumulated depreciation on property and equipment |  |  | $ 166,066 |  |

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