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Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Cash equivalents:
Total assets at fair value on a recurring basis	$ 8,418us-gaap_AssetsFairValueDisclosureRecurring	$ 8,427us-gaap_AssetsFairValueDisclosureRecurring
Other long-term liabilities:
Total liabilities at fair value on a recurring basis	2,398us-gaap_LiabilitiesFairValueDisclosureRecurring	2,115us-gaap_LiabilitiesFairValueDisclosureRecurring
Money Market Funds [Member]
Cash equivalents:
Total assets at fair value on a recurring basis	8,275us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = us-gaap_MoneyMarketFundsMember	8,382us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = us-gaap_MoneyMarketFundsMember
Deferred Payments [Member]
Other long-term liabilities:
Total liabilities at fair value on a recurring basis	2,398us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = stra_DeferredPaymentsMember	2,115us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = stra_DeferredPaymentsMember
Interest Rate Swaps [Member]
Cash equivalents:
Total assets at fair value on a recurring basis	143us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember	45us-gaap_AssetsFairValueDisclosureRecurring / 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	8,275us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	8,382us-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	8,275us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = us-gaap_MoneyMarketFundsMember	8,382us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = us-gaap_MoneyMarketFundsMember
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 Swaps [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	45us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Other long-term liabilities:
Total liabilities at fair value on a recurring basis
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 Swaps [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	45us-gaap_AssetsFairValueDisclosureRecurring / 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	2,398us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	2,115us-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	2,398us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = stra_DeferredPaymentsMember	2,115us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = stra_DeferredPaymentsMember
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Swaps [Member]
Cash equivalents:
Total assets at fair value on a recurring basis

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