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Revenue Recognition - Graduation Fund (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Graduation Fund [Roll Forward] |  |
Balance at beginning of period | $ 49,641 | $ 43,329
Revenue deferred | 26,462 | 30,071
Benefit redeemed | (22,789) | (23,759)
Balance at end of period | 53,314 | 49,641
Undergraduate Degree Programs |  |
Graduation Fund [Roll Forward] |  |
Balance at beginning of period | 49,600 |
Balance at end of period | $ 52,600 | $ 49,600

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- 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 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

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- Definition Graduation Fund [Roll Forward] + References No definition available. + Details
Name: | stra_GraduationFundRollForward
Namespace Prefix: | stra_
Data Type: | xbrli:stringItemType
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
Name: | stra_RevenueDeferred
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=stra_UndergraduateDegreeProgramsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |