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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 USD ($) Segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounting Policies [Line Items] |  |  |
Number of reporting segments | Segment | 2 |  |
Length of academic year | 210 days |  |
Advertising costs | $ 143,300,000 | $ 130,900,000 | $ 126,400,000
CCKF [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Percentage of investment in equity affiliate | 30.70% |  |
Non controlling interest | $ 3,200,000 |  |
Restricted Cash [Member] | Trident [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Amount set aside in escrow account | $ 4,000,000.0 | $ 0 |
Cash Receipts [Member] | Credit Concentration Risk [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Percentage of cash receipts from Title IV Program funding | 80.00% | 79.00% | 79.00%
Title IV Programs [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Student fund portion in cash, and cash equivalents | $ 10,000,000.0 | $ 9,600,000 |
Maximum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Length of academic terms | 84 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 |  |
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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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