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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) Segment | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Accounting Policies [Line Items] |  |  |
Number of reporting segments | Segment | 2 |  |
Length of academic year | 210 days |  |
Term of non degree professional development and continuing education offerings through subscription based access | 364 days |  |
Advertising costs | $ 126.8 | $ 137.2 | $ 143.3
Restricted Cash [Member] | Hippo, CalSouthern and Dojo [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Amount set aside in escrow account | $ 9.5 |  |
Cash Receipts [Member] | Credit Concentration Risk [Member] | Higher Education Act [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Percentage of cash receipts from Title IV Program funding | 79.00% | 81.00% | 80.00%
Title IV Programs [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Student fund portion in cash, and cash equivalents | $ 10.0 | $ 10.4 |
Maximum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Length of academic terms | 84 days |  |
Term of non degree professional development and continuing education offerings through subscription based access | 364 days |  |
Term of non degree professional development and continuing education offerings through online courses | 126 days |  |
Maturity period of cash equivalents including short-term investments | three months |  |
Lease term range, years | 10 years |  |
Number of renewal options for extended terms | 4 years |  |
Minimum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Number of days past due to write off student receivables | 90 days |  |
Length of academic terms | 56 days |  |
Term of non degree professional development and continuing education offerings through online courses | 84 days |  |
Lease term range, years | 5 years |  |
Number of renewal options for extended terms | 1 year |  |
Student Loans [Member] | Maximum [Member] | Current Assets [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Student receivables period | 1 year |  |
Student Loans [Member] | Minimum [Member] | Non Current Assets [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Student receivables period | 1 year |  |

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