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Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 01, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) Agency project segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Costs capitalized to obtain or fulfill contracts with customers |  |  | $ 0 |  |  |
Reduction in revenue due to scholarships offered to students |  | $ 101,176 |  |  | $ 196,334 |
Other assets |  |  | 1,706 | $ 478 |  |
Unbilled revenue amounts |  |  | 118 |  |  |
Amounts written off |  |  | 0 |  |  |
Allowance for doubtful accounts |  |  | $ 0 |  |  |
Number of operating segments | segment |  |  | 1 |  |  |
Number of reporting units | segment |  |  | 1 |  |  |
Lease liabilities |  |  | $ 28,603 |  |  | $ 498
Right-of-use assets acquired |  |  | 13,069 |  |  |
Lease liability acquired |  |  | $ 13,069 |  |  |
Election of hindsight practical expedient |  |  | true |  |  |
Election of package of practical expedients |  |  | true |  |  |
Loss in investment interest and other |  |  |  | $ 372 |  |
Capitalized interest rate on borrowings to finance improvements |  |  |  | 3.70% | 2.80% |
Property and equipment, useful life |  |  | 15 years |  |  |
Royalty amortization period |  |  | 20 years |  |  |
Remaining prepaid royalty assets impaired | $ 3,037 |  |  |  |  |
Reserve for uncertain tax positions including interest and penalties |  |  | $ 6,773 | $ 1,960 |  |
Amortization of other current assets |  |  | twelve-month |  |  |
Number of stages of software development projects | project |  |  | 3 |  |  |
Computer Software |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated average useful life |  |  | 3 years |  |  |
Capitalized Content Development |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Other assets |  |  | $ 1,077 |  |  |
Estimated average useful life |  |  | 4 years |  |  |
Furniture, Fixtures and Equipment |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property and equipment, useful life |  |  | 10 years |  |  |
Computer Equipment |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property and equipment, useful life |  |  | 4 years |  |  |
Vehicles |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property and equipment, useful life |  |  | 5 years |  |  |
Minimum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Initial contract terms |  |  | 7 years |  |  |
Number of major rating agencies reporting credit ratings | Agency |  |  | 1 |  |  |
Minimum | Land Improvements and Buildings |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property and equipment, useful life |  |  | 10 years |  |  |
Maximum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Initial contract terms |  |  | 15 years |  |  |
Maximum | Land Improvements and Buildings |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property and equipment, useful life |  |  | 40 years |  |  |

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