XML 73 R59.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Other Employee Benefit Plans (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Other Employee Benefit Plans [Abstract] |  |  |
Maximum annual contribution to 401(k) plan by employees, effective January 1, 2016 | $ 18,000 |  |
Percentage of company matching contribution to 401(K) plan | 50.00% |  |
Defined contribution plan employer matching contribution percent | 3.00% |  |
Company's contributions to 401(K) plan | $ 1,100,000 | $ 900,000 | $ 1,100,000
Common stock shares purchase price limit for employees as percentage of market value under Employee Stock Purchase Plan | 90.00% |  |
Employee stock purchase plan maximum percentage of purchase employee can make on eligible compensation | 10.00% |  |
Maximum number of shares available for purchase by participating employees | 2,500,000 |  |

X
- 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

X
- 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

X
- 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

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- 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

X
- 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

X
- 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