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Significant Accounting Policies - Graduation Fund (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 USD ($) item | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
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 | $ 29,499,000 | $ 20,937,000 |
Revenue deferred | 17,494,000 | 14,753,000 |
Benefit redeemed | (12,551,000) | (9,139,000) |
Balance at end of year | 34,442,000 | $ 26,551,000 |
Current Liability [Member] |  |  |
Graduation fund estimated to be redeemed | 19,300,000 |  |
Other Assets [Member] |  |  |
Restricted cash |  |  |
Minimum protective endowment | 500,000 |  |
Other Current Assets [Member] |  |  |
Restricted cash |  |  |
Funds payable for students who withdraw from the University | $ 8,000 |  | $ 13,000

X
- Definition Current year redemptions of graduation fund credits by students. + References No definition available. + Details
Name: | stra_BenefitRedeemed
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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Namespace Prefix: | stra_
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- Definition The estimated amount of graduation fund to be redeemed in the next twelve months. + References No definition available. + Details
Name: | stra_EstimatedGraduationFundToBeRedeemedNextTwelveMonths
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Expected collection period of tuition receivable. + References No definition available. + Details
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Namespace Prefix: | stra_
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Balance Type: | na
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X
- Definition Represents funds payable when a student withdraws from the University. + References No definition available. + Details
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Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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
Name: | stra_GraduationFundLiability
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the number of free courses. + References No definition available. + Details
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Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of successfully completed courses. + References No definition available. + Details
Name: | stra_NumberOfSuccessfullyCompletedCourses
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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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Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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Period Type: | instant

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