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Revenue Recognition - Graduation Fund (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Revenue from Contract with Customer [Abstract] |  |
Balance at beginning of period | $ 43,329 | $ 37,400
Revenue deferred | 6,945 | 5,885
Benefit redeemed | (5,798) | (4,967)
Balance at end of period | $ 44,476 | $ 38,318

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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 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

X
- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration