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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) Segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Accounting Policies [Line Items] |  |  |
Number of reporting segments | Segment | 3 |  |
Securitization of letters of credit | $ 0.3 | $ 0.8 |
Advertising costs | $ 126.4 | $ 136.1 | $ 154.9
CCKF [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Percentage of investment in equity affiliate | 30.70% |  |
Non controlling interest | $ 2.7 |  |
Title IV Programs [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Student fund portion in cash, and cash equivalents | $ 6.2 |  |
Maximum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Maturity period of cash equivalents including short-term investments | three months |  |
Minimum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Number of days past due to write off student receivables | 90 days |  |
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 |  |
Cash Receipts [Member] | Credit Concentration Risk [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Percentage of cash receipts from Title IV Program funding | 79.00% | 78.00% | 76.00%

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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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