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Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2016
Significant Accounting Policies [Abstract]
Percentage of tuition revenue in total revenue	95.00%
Unused books and academic material refundable period	21 days

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