Accounting policies.

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Loans receivable repayment period.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2023 USD ($) Segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Accounting Policies [Line Items]
Number of reporting segments \| Segment	2
Length of academic year	210 days
Allowance for credit losses for available for sale securities	$ 0	$ 0
Advertising costs	102,600,000	$ 126,800,000	$ 137,200,000
Restricted Cash [Member] \| Hippo [Member]
Accounting Policies [Line Items]
Amount set aside in escrow account	$ 1,000,000
Cash Receipts [Member] \| Credit Concentration Risk [Member] \| Higher Education Act [Member]
Accounting Policies [Line Items]
Percentage of cash receipts from Title IV Program funding	76.00%	79.00%	81.00%
Title IV Programs [Member]
Accounting Policies [Line Items]
Student fund portion in cash, and cash equivalents	$ 9,500,000	$ 10,000,000.0
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