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Fair Value Measurement (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Money Market Funds [Member] |  |
Cash equivalents: |  |
Total assets at fair value on a recurring basis | $ 10,108 | $ 100
Deferred payments [Member] |  |
Other long-term liabilities: |  |
Total liabilities at fair value on a recurring basis | 12,340 | 3,278
Quoted Prices In Active Markets For Identical Assets/Liabilities (Level 1) [Member] | Money Market Funds [Member] |  |
Cash equivalents: |  |
Total assets at fair value on a recurring basis | 10,108 | 100
Significant Unobservable Inputs (Level 3) [Member] | Deferred payments [Member] |  |
Other long-term liabilities: |  |
Total liabilities at fair value on a recurring basis | $ 12,340 | $ 3,278

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- Definition Cash equivalents fair value. + References No definition available. + Details
Name: | stra_CashEquivalentsFairValueAbstract
Namespace Prefix: | stra_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Other liabilities fair value. + References No definition available. + Details
Name: | stra_OtherLiabilitiesFairValueAbstract
Namespace Prefix: | stra_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=stra_DeferredPaymentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |