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Revenue Recognition - Graduation Fund (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Graduation Fund [Roll Forward] |  |
Balance at beginning of period | $ 52,024 | $ 53,314
Revenue deferred | 12,647 | 15,005
Benefit redeemed | (16,295) | (16,733)
Balance at end of period | $ 48,376 | $ 51,586

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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

X
- 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