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Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Graduation fund liability
Balance at December 31, 2013	$ 1,898stra_GraduationFundLiability
Revenue deferred	8,507stra_RevenueDeferred
Benefit redeemed	(699)stra_BenefitRedeemed
Balance at December 31, 2014	$ 9,706stra_GraduationFundLiability

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

- 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