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Revenue Recognition - Graduation Fund (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Graduation Fund [Roll Forward] |  |
Balance at beginning of period | $ 53,314 | $ 49,641
Revenue deferred | 6,516 | 7,179
Benefit redeemed | (5,421) | (5,608)
Balance at end of period | $ 54,409 | $ 51,212

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 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