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Restructuring and Related Charges (Details) - item | 1 Months Ended | 3 Months Ended
--- | --- | ---
Oct. 31, 2013 | Mar. 31, 2018
Restructuring and Related Charges [Abstract] |  |
Campus location closed | 20 |
Lease marginal borrowing rate |  | 4.50%

X
- Definition Campus location closed. + References No definition available. + Details
Name: | stra_CampusLocationClosed
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Marginal borrowing rate of lease. + References No definition available. + Details
Name: | stra_MarginalBorrowingRateOfLease
Namespace Prefix: | stra_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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