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v2.4.1.9

Other Employee Benefit Plans (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract] |  |  |
Maximum annual contribution to 401(k) plan by employees, effective January 1, 2015 | $ 18,000 us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount |  |
Percentage of company matching contribution to 401(K) plan | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch |  |
Defined contribution plan employer matching contribution percent | 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |  |
Company's contributions to 401(K) plan | $ 900,000 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 1,100,000 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 2,900,000 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Common stock shares purchase price limit for employees as percentage of market value under Employee Stock Purchase Plan | 90.00%stra_EmployeeStockPurchasePlanPercentageOfPurchasePriceFromMarketValue |  |
Employee stock purchase plan maximum percentage of purchase employee can make on eligible compensation | 10.00%stra_EmployeeStockPurchasePlanMaximumPercentageOfPurchaseEmployeeCanMakeOnEligibleCompensation |  |
Maximum number of shares available for purchase by participating employees | 2,500,000 stra_MaximumNumberOfSharesMadeAvailableForPurchaseByParticipatingEmployeesUnderEmployeeStockPurchasePlan |  |

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- Definition Employee stock purchase plan, maximum percentage of purchase an employee can make on eligible compensation. + References No definition available. + Details
Name: | stra_EmployeeStockPurchasePlanMaximumPercentageOfPurchaseEmployeeCanMakeOnEligibleCompensation
Namespace Prefix: | stra_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Employee stock purchase plan, percentage of purchase price from market value. + References No definition available. + Details
Name: | stra_EmployeeStockPurchasePlanPercentageOfPurchasePriceFromMarketValue
Namespace Prefix: | stra_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum number of shares made available for purchase by participating employees under employee stock purchase plan. + References No definition available. + Details
Name: | stra_MaximumNumberOfSharesMadeAvailableForPurchaseByParticipatingEmployeesUnderEmployeeStockPurchasePlan
Namespace Prefix: | stra_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration