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Significant Accounting Policies (Details) | 9 Months Ended
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Sep. 30, 2016 USD ($)
Significant Accounting Policies [Abstract] |
Percentage of tuition revenue in total revenue | 95.00%
Unused books and academic material refundable period | 21 days
Goodwill and intangible assets impairment | $ 0

X
- Definition Percentage of tuition revenue in total revenue. + References No definition available. + Details
Name: | stra_PercentageOfTuitionRevenueInRevenue
Namespace Prefix: | stra_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The period to return unused books and related academic materials in order to receive a full refund. + References No definition available. + Details
Name: | stra_UnusedBooksAndAcademicMaterialRefundablePeriod
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill. + References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration