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Significant Accounting Policies - Reclassification of Operation Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
I&SC | $ 130,704 | $ 130,712 | $ 103,079 | $ 69,299 | $ 68,452 | $ 264,754 | $ 137,751
G&A | $ 68,374 | 68,541 | 61,976 | 32,176 | 31,342 | $ 132,513 | $ 63,518
Instruction and educational support | Previously Reported |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
I&SC |  | 118,320 | 93,290 | 64,690 | 63,776 |  |
G&A |  | 0 | 0 | 0 | 0 |  |
Admissions advisory | Previously Reported |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
I&SC |  | 12,392 | 9,789 | 4,609 | 4,676 |  |
G&A |  | 0 | 0 | 0 | 0 |  |
Marketing | Previously Reported |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
I&SC |  | 0 | 0 | 0 | 0 |  |
G&A |  | 49,577 | 46,165 | 21,113 | 20,124 |  |
General and administration | Previously Reported |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
I&SC |  | 0 | 0 | 0 | 0 |  |
G&A |  | $ 18,964 | $ 15,811 | $ 11,063 | $ 11,218 |  |

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