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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 | $ 8,418 us-gaap_AssetsFairValueDisclosureRecurring | $ 8,427 us-gaap_AssetsFairValueDisclosureRecurring
Other long-term liabilities: |  |
Total liabilities at fair value on a recurring basis | 2,398 us-gaap_LiabilitiesFairValueDisclosureRecurring | 2,115 us-gaap_LiabilitiesFairValueDisclosureRecurring
Money Market Funds [Member] |  |
Cash equivalents: |  |
Total assets at fair value on a recurring basis | 8,275 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = us-gaap_MoneyMarketFundsMember | 8,382 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = us-gaap_MoneyMarketFundsMember
Deferred Payments [Member] |  |
Other long-term liabilities: |  |
Total liabilities at fair value on a recurring basis | 2,398 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = stra_DeferredPaymentsMember | 2,115 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = stra_DeferredPaymentsMember
Interest Rate Swaps [Member] |  |
Cash equivalents: |  |
Total assets at fair value on a recurring basis | 143 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember | 45 us-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 | 8,275 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 8,382 us-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 | 8,275 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = us-gaap_MoneyMarketFundsMember | 8,382 us-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 | 143 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 45 us-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 | 143 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember | 45 us-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 | 2,398 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 2,115 us-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 | 2,398 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = stra_DeferredPaymentsMember | 2,115 us-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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