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Significant Accounting Policies (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Graduation fund liability
Balance at December 31, 2014	$ 9,706
Revenue deferred	12,423
Benefit redeemed	(3,974)
Balance at September 30, 2015	$ 18,155

X

- Definition

Current year redemptions of graduation fund credits by students.

+ References

No definition available.

+ Details

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

X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to graduation fund liability.

+ References

No definition available.

+ Details

Name:	stra_GraduationFundLiability
Namespace Prefix:	stra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Graduation Fund Liability [Abstract]

+ References

No definition available.

+ Details

Name:	stra_GraduationFundLiabilityAbstract
Namespace Prefix:	stra_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Additional graduation fund liability generated in the current year for services to be performed in the future.

+ References

No definition available.

+ Details

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