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Revenue Recognition - Graduation Fund (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Graduation Fund [Roll Forward]
Balance at beginning of period	$ 53,314	$ 49,641
Revenue deferred	15,005	19,044
Benefit redeemed	(16,733)	(17,077)
Balance at end of period	$ 51,586	$ 51,608

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 [Roll Forward]

+ References

No definition available.

+ Details

Name:	stra_GraduationFundRollForward
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:	credit
Period Type:	duration