Accounting policies.

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Amount of funds authorized by students to be retained which are in excess of tuition billings.

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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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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) Segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounting Policies [Line Items]
Number of reporting segments \| Segment	2
Length of academic year	210 days
Advertising costs	$ 137.2	$ 143.3	$ 130.9
CCKF [Member]
Accounting Policies [Line Items]
Percentage of investment in equity affiliate	30.70%
Non controlling interest	$ 3.2
Restricted Cash [Member] \| Trident and Hippo [Member]
Accounting Policies [Line Items]
Amount set aside in escrow account	$ 5.2
Cash Receipts [Member] \| Credit Concentration Risk [Member] \| Higher Education Act [Member]
Accounting Policies [Line Items]
Percentage of cash receipts from Title IV Program funding	81.00%	80.00%	79.00%
Title IV Programs [Member]
Accounting Policies [Line Items]
Student fund portion in cash, and cash equivalents	$ 10.4	$ 10.0
Maximum [Member]
Accounting Policies [Line Items]
Length of academic terms	84 days
Length of Non-Degree Professional Programs	364 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
Length of Non-Degree Professional Programs	112 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