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Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Detail) - Allowance for Doubtful Accounts Receivable [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | $ 5,907 | $ 5,918 | $ 5,137
Charged to Expense | 8,669 | 18,478 | 18,639
Deductions | (14,576) | (18,489) | (17,858)
Balance at End of Year |  | $ 5,907 | $ 5,918
Grand Canyon University [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Deductions | $ 6,093 |  |

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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