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v3.20.2

Other Long-Term Liabilities - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |
Deferred payment arrangements value | $ 0.6 | $ 2.2
Jack Welch Management Institute |  |
Business Acquisition [Line Items] |  |
Funds received from investor | $ 2.8 |

X
- Definition The value of the deferred payment arrangement with one of the sellers in connection with an acquisition. + References No definition available. + Details
Name: | stra_DeferredPaymentArrangementValue
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Seller's contribution to the Company representing the seller's continuing interest in the assets acquired. + References No definition available. + Details
Name: | stra_FundsReceivedFromInvestor
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=stra_JackWelchManagementInstituteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |