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Commitments and Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) lease	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Commitments and Contingencies [Abstract]
Number of long-term, non-cancelable operating leases | lease	87
Rent expense	$ 35.9	$ 33.6	$ 33.7
Rent expense (benefit) related to facilities no longer in use	$ 0.3	$ 0.3	$ (1.9)

X

- Definition

Represents the number of long-term, non-cancelable operating leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	stra_
Data Type:	xbrli:integerItemType
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X

- Definition

The amount of expense (benefit) related to facilities no longer in use.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration