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Student Receivables - Changes in Current and Non-Current Receivables Allowance (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Receivables [Abstract] |  |  |  |
Recoveries of amounts previously written off | $ 1.2 | $ 1.2 | $ 2.5 | $ 2.7

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- Definition The cash inflow from loans reinstated and recovered that were previously deemed uncollectible. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
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