XML 40 R27.htm IDEA: XBRL DOCUMENT v3.8.0.1

Significant Accounting Policies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Significant Accounting Policies [Abstract]
Items within other comprehensive income	$ 0
Percentage of tuition revenue in total revenue	96.00%

X

- Definition

Represents activity within other comprehensive income.

+ References

No definition available.

+ Details

Name:	stra_ItemsWithinOtherComprehensiveIncome
Namespace Prefix:	stra_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration