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Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Cash equivalents:
Total assets at fair value on a recurring basis	$ 10,076us-gaap_AssetsFairValueDisclosureRecurring	$ 8,418us-gaap_AssetsFairValueDisclosureRecurring
Other long-term liabilities:
Total liabilities at fair value on a recurring basis	2,880us-gaap_LiabilitiesFairValueDisclosureRecurring	2,398us-gaap_LiabilitiesFairValueDisclosureRecurring
Money market funds [Member]
Cash equivalents:
Total assets at fair value on a recurring basis	10,076us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = us-gaap_MoneyMarketFundsMember	8,275us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = us-gaap_MoneyMarketFundsMember
Deferred payments [Member]
Other long-term liabilities:
Total liabilities at fair value on a recurring basis	2,688us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = stra_DeferredPaymentsMember	2,398us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = stra_DeferredPaymentsMember
Interest rate swap [Member]
Cash equivalents:
Total assets at fair value on a recurring basis		143us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember
Other long-term liabilities:
Total liabilities at fair value on a recurring basis	192us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Cash equivalents:
Total assets at fair value on a recurring basis	10,076us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	8,275us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Other long-term liabilities:
Total liabilities at fair value on a recurring basis
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	10,076us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = us-gaap_MoneyMarketFundsMember	8,275us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = us-gaap_MoneyMarketFundsMember
Other long-term liabilities:
Total liabilities at fair value on a recurring basis
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Deferred payments [Member]
Other long-term liabilities:
Total liabilities at fair value on a recurring basis
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Interest rate swap [Member]
Cash equivalents:
Total assets at fair value on a recurring basis
Significant Other Observable Inputs (Level 2) [Member]
Cash equivalents:
Total assets at fair value on a recurring basis		143us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Other long-term liabilities:
Total liabilities at fair value on a recurring basis	192us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant Other Observable Inputs (Level 2) [Member] | Money market funds [Member]
Cash equivalents:
Total assets at fair value on a recurring basis
Significant Other Observable Inputs (Level 2) [Member] | Deferred payments [Member]
Other long-term liabilities:
Total liabilities at fair value on a recurring basis
Significant Other Observable Inputs (Level 2) [Member] | Interest rate swap [Member]
Cash equivalents:
Total assets at fair value on a recurring basis		143us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember
Other long-term liabilities:
Total liabilities at fair value on a recurring basis	192us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember
Significant Unobservable Inputs (Level 3) [Member]
Cash equivalents:
Total assets at fair value on a recurring basis
Other long-term liabilities:
Total liabilities at fair value on a recurring basis	2,688us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	2,398us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Significant Unobservable Inputs (Level 3) [Member] | Money market funds [Member]
Cash equivalents:
Total assets at fair value on a recurring basis
Significant Unobservable Inputs (Level 3) [Member] | Deferred payments [Member]
Other long-term liabilities:
Total liabilities at fair value on a recurring basis	2,688us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = stra_DeferredPaymentsMember	2,398us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = stra_DeferredPaymentsMember
Significant Unobservable Inputs (Level 3) [Member] | Interest rate swap [Member]
Other long-term liabilities:
Total liabilities at fair value on a recurring basis

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