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Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 01, 2018 | Dec. 31, 2021 USD ($) Agency project | Dec. 31, 2021 USD ($) Agency project segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Summary Of Significant Accounting Policies |  |  |  |  |  |
Investments |  | $ 0 | $ 0 | $ 10,840 |  |
Other assets |  | 1,943 | $ 1,943 | 1,844 |  |
Number of operating segments | segment |  |  | 1 |  |  |
Number of reporting units | segment |  |  | 1 |  |  |
Unbilled revenue amounts |  | 3,841 | $ 3,841 | 294 |  |
Amounts written off |  |  | 0 |  |  |
Allowance for doubtful accounts |  | 0 | 0 |  |  |
Secured Note receivable, carrying value |  |  |  | 964,912 |  |
Secured Note receivable, fair value |  |  |  | 1,049,458 |  |
Reserve for uncertain tax positions including interest and penalties |  | $ 14,108 | $ 14,108 | 11,318 |  |
Number of stages of software development projects | project |  | 3 | 3 |  |  |
Allowance for credit losses |  |  |  | 5,000 |  |
Reversal of credit loss reserve |  | $ 5,000 | $ 5,000 |  |  |
Stockholders equity |  | 1,045,047 | 1,045,047 | 1,574,329 | 1,443,433 | $ 1,213,597
Income tax expense |  |  | $ 70,945 | $ 75,944 | 58,327 |
Revenue Benchmark | Customer Concentration Risk | Grand Canyon University |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |
Concentration risk percentage |  |  | 85.90% | 86.80% |  |
Computer Software, Intangible Asset |  |  |  |  |  |
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 |  | $ 1,168 | $ 1,168 | $ 1,198 |  |
Cash Flow Hedging |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |
Effective portion of losses on derivatives included as a component of other comprehensive income, net of taxes |  |  |  |  | (497) |
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 | 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 |  |  |
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 |
Stockholders equity |  |  |  |  | (3,832) |
Income tax expense |  |  |  |  | $ 1,168 |

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