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Significant Accounting Policies - Graduation Fund (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 USD ($) item | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Schedule of activity in the Graduation Fund |  |  |
Consecutive terms of non attendance in which Graduation Fund credits will be lost | item | 1 |  |
Number of free courses | item | 1 |  |
Number of successfully completed courses | item | 3 |  |
Expected collection period of tuition receivable | 12 months |  |
Balance at beginning of year | $ 20,937,000 | $ 9,706,000 |
Revenue deferred | 17,799,000 | 12,423,000 |
Benefit redeemed | (12,185,000) | (3,974,000) |
Balance at end of year | 26,551,000 | $ 18,155,000 |
Current Liability [Member] |  |  |
Schedule of activity in the Graduation Fund |  |  |
Graduation fund estimated to be redeemed | 12,700,000 |  |
Other Assets [Member] |  |  |
Restricted cash |  |  |
Restricted cash | 0 |  | $ 0
Minimum protective endowment | $ 500,000 |  |

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- Definition Current year redemptions of graduation fund credits by students. + References No definition available. + Details
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- Definition Represents the number of consecutive term of non-attendance in which Graduation Fund credits will be lost. + References No definition available. + Details
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- Definition The estimated amount of graduation fund to be redeemed in the next twelve months. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Expected collection period of tuition receivable. + References No definition available. + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to graduation fund liability. + References No definition available. + Details
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- Definition Graduation Fund Liability [Abstract] + References No definition available. + Details
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- Definition Represents the number of free courses. + References No definition available. + Details
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Period Type: | duration

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- Definition Represents the number of successfully completed courses. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Additional graduation fund liability generated in the current year for services to be performed in the future. + References No definition available. + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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