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Commitments and Contingencies (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) lease | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Commitments and Contingencies [Abstract] |  |  |
Number of long-term, non-cancelable operating leases | lease | 87 |  |
Rent expense | $ 35.9 | $ 33.6 | $ 33.7
Rent expense (benefit) related to facilities no longer in use | $ 0.3 | $ 0.3 | $ (1.9)

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- Definition Represents the number of long-term, non-cancelable operating leases. + References No definition available. + Details
Name: | stra_NumberOfLongTermNonCancelableOperatingLeases
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of expense (benefit) related to facilities no longer in use. + References No definition available. + Details
Name: | stra_RentExpenseBenefitRelatedToFacilitiesNoLongerInUse
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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