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Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 01, 2018 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2023 USD ($) project Agency segment item | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Investments |  |  |  | $ 98,031 | $ 61,295 |  |
Other assets |  |  |  | $ 1,641 | 1,687 |  |
Number of operating segments | segment |  |  |  | 1 |  |  |
Number of reporting units | segment |  |  |  | 1 |  |  |
Number of university partners | item |  |  |  | 25 |  |  |
Goodwill |  |  |  | $ 160,766 | 160,766 |  |
Unbilled revenue amounts |  |  |  | 188 | 5,560 |  |
Amounts written off |  |  |  | 0 |  |  |
Allowance for doubtful accounts |  |  |  | 0 |  |  |
Reserve for uncertain tax positions including interest and penalties |  |  |  | $ 13,631 | 15,862 |  |
Number of stages of software development projects | project |  |  |  | 3 |  |  |
Stockholders equity |  | $ 1,045,047 |  | $ 718,014 | 637,619 | $ 1,045,047 | $ 1,574,329
Income tax expense |  |  |  | 54,690 | 55,444 | $ 70,945 |
Reversal of credit loss reserve |  | $ 5,000 |  |  |  |  |
Cash in excess of FDIC insured limits |  |  |  | $ 145,474 | $ 119,639 |  |
Revenue Benchmark | Customer Concentration Risk | Grand Canyon University |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 87.80% | 85.80% |  |
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 |  |  |  | $ 746 | $ 910 |  |
University partner relationships |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Estimated average useful life |  |  |  | 25 years |  |  |
Furniture, Fixtures and Equipment |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  | 10 years |  |  |
Computer Equipment |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  | 4 years |  |  |
Vehicles |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  | 5 years |  |  |
Minimum |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Initial contract terms of service agreements |  |  |  | 7 years |  |  |
Number of major rating agencies reporting credit ratings | Agency |  |  |  | 1 |  |  |
Minimum | Land Improvements and Buildings |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  | 10 years |  |  |
Maximum |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Initial contract terms of service agreements |  |  |  | 15 years |  |  |
Maximum | Land Improvements and Buildings |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  | 40 years |  |  |
Asset Purchase Agreement | Grand Canyon University | Disposed of by Sale |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Purchase price of assets | $ 870,097 |  |  |  |  |  |
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
Stockholders equity |  |  | (3,832) |  |  |  |
Income tax expense |  |  | $ 1,168 |  |  |  |

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