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Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 39 Months Ended |  |  |  |  |
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Jul. 01, 2018 USD ($) | Sep. 30, 2021 USD ($) item | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) segment item | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2021 USD ($) item | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($)
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on Secured Note |  |  |  | 6.00% |  |  |  |  |  |  |  |
Other assets |  | $ 2,310 |  | $ 2,310 |  |  | $ 2,310 |  |  | $ 1,844 |  |
Number of operating segments | segment |  |  |  | 1 |  |  |  |  |  |  |  |
Number of reporting units | segment |  |  |  | 1 |  |  |  |  |  |  |  |
Unbilled revenue |  | 11,604 |  | $ 11,604 |  |  | 11,604 |  |  | 294 |  |
Amounts written off |  |  |  | 0 |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | 0 |  | 0 |  |  | 0 |  |  |  |  |
Lease liabilities |  | 60,674 |  | 60,674 |  |  | 60,674 |  |  |  |  |
Secured Note receivable, carrying value |  | 964,912 |  | 964,912 |  |  | 964,912 |  |  | 964,912 |  |
Secured Note receivable, fair value |  | $ 1,037,256 |  | $ 1,037,256 |  |  | $ 1,037,256 |  |  | 1,049,458 |  |
Number of university partners | item |  | 27 |  | 27 |  |  | 27 |  |  |  |  |
Allowance for credit losses |  | $ 5,000 | $ 5,000 | $ 5,000 | $ 5,000 |  | $ 5,000 |  |  | 5,000 |  |
Stockholders equity |  | 1,400,776 | 1,520,983 | 1,400,776 | 1,520,983 | $ 1,443,433 | 1,400,776 | $ 1,542,683 | $ 1,588,678 | 1,574,329 | $ 1,489,387 | $ 1,448,008
Income tax expense |  | 12,166 | 13,141 | $ 47,186 | $ 51,278 |  |  |  |  |  |  |
Revenue Benchmark | Customer Concentration Risk | Grand Canyon University |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 85.00% | 86.50% |  |  |  |  |  |  |
Computer Software |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |
Estimated average useful life |  |  |  | 3 years |  |  |  |  |  |  |  |
Capitalized Content Development |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |
Estimated average useful life |  |  |  | 4 years |  |  |  |  |  |  |  |
Other assets |  | $ 1,209 |  | $ 1,209 |  |  | 1,209 |  |  | $ 1,198 |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |
Initial contract terms of service agreements |  |  |  | 7 years |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |
Initial contract terms of service agreements |  |  |  | 15 years |  |  |  |  |  |  |  |
Grand Canyon University |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of assets | $ 870,097 |  |  |  |  |  |  |  |  |  |  |
Interest rate on Secured Note | 6.00% |  |  |  |  |  |  |  |  |  |  |
Funding provided to GCU, net of repayments |  |  |  |  |  |  | $ 99,815 |  |  |  |  |
Master Services Agreement | Grand Canyon University |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |
Percentage of tuition and fee revenue used for closing of purchase agreement | 60.00% |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of Adoption Adjustment | ASU 2016-13 |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  |  | 5,000 |  | $ 5,000 | 5,000 |  |  |  |  |  |
Stockholders equity |  |  | $ (3,832) |  | (3,832) | (3,832) |  |  |  |  |  |
Income tax expense |  |  |  |  | $ 1,168 | $ 1,168 |  |  |  |  |  |

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