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Significant Accounting Policies (Details)	9 Months Ended
	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