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Revenue Recognition - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) Course term
Graduation Fund [Line Items]
Number of free courses | Course	1
Number of successfully completed courses | Course	3
Consecutive terms of non attendance in which Graduation Fund credits will be lost | term	1
Expected collection period of current tuition receivable	12 months
Graduation fund estimated to be redeemed | $	$ 20.1
Unbilled receivables | $	$ 1.5
Minimum
Graduation Fund [Line Items]
Expected collection period of noncurrent tuition receivable	2 years
Maximum
Graduation Fund [Line Items]
Expected collection period of noncurrent tuition receivable	4 years

X

- Definition

Represents the number of consecutive term of non-attendance in which Graduation Fund credits will be lost.

+ References

No definition available.

+ Details

Name:	stra_ConsecutiveTermsOfNonAttendanceInWhichGraduationFundCreditsWillBeLost
Namespace Prefix:	stra_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The estimated amount of graduation fund to be redeemed in the next twelve months.

+ References

No definition available.

+ Details

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

X

- Definition

Expected collection period of tuition receivable current.

+ References

No definition available.

+ Details

Name:	stra_ExpectedCollectionPeriodOfTuitionReceivableCurrent
Namespace Prefix:	stra_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Expected collection period of tuition receivable noncurrent.

+ References

No definition available.

+ Details

Name:	stra_ExpectedCollectionPeriodOfTuitionReceivableNoncurrent
Namespace Prefix:	stra_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of free courses.

+ References

No definition available.

+ Details

Name:	stra_NumberOfFreeCourses
Namespace Prefix:	stra_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of successfully completed courses.

+ References

No definition available.

+ Details

Name:	stra_NumberOfSuccessfullyCompletedCourses
Namespace Prefix:	stra_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	us-gaap_UnbilledReceivablesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: