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Other Employee Benefit Plans (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Employee Benefit Plans (Textual)
Percentage of company additional matching contribution to 401(k) plan	50.00%
Percentage of company matching contribution to 401(K) plan	100.00%
Defined contribution plan employer matching contribution percent	3.00%
Company's contributions to 401(K) plan	$ 2,900,000	$ 2,700,000	$ 2,300,000
Maximum annual contribution to 401(k) plan by employees, effective January 1, 2013	$ 17,500
Percentage of company matching contribution to 401(K) plan, Effective January 1, 2013	50.00%
Defined contribution plan employer matching contribution percent, Effective January 1, 2013	3.00%
Common stock shares purchase price limit for employees as percentage of market value under Employee Stock Purchase Plan	90.00%
Purchase limitation of an employee's as percentage of eligible compensation	10.00%
Maximum number of shares available for purchase by participating employees	2,500,000
Minimum [Member]
Other Employee Benefit Plans (Textual)
Percentage of company additional matching contribution to 401(k) plan	3.00%
Maximum [Member]
Other Employee Benefit Plans (Textual)
Percentage of company additional matching contribution to 401(k) plan	5.00%

X

- Definition

Amended future defined contribution plan employer matching contribution percent.

+ References

No definition available.

+ Details

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Namespace Prefix:	stra_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amended future percent of the employer's matching of employee deferrals.

+ References

No definition available.

+ Details

Name:	stra_DefinedContributionPlanMaximumAmendedFutureAnnualContributionPerEmployeePercent
Namespace Prefix:	stra_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Employee stock purchase plan, maximum percentage of purchase an employee can make on eligible compensation.

+ References

No definition available.

+ Details

Name:	stra_EmployeeStockPurchasePlanMaximumPercentageOfPurchaseEmployeeCanMakeOnEligibleCompensation
Namespace Prefix:	stra_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Employee stock purchase plan, percentage of purchase price from market value.

+ References

No definition available.

+ Details

Name:	stra_EmployeeStockPurchasePlanPercentageOfPurchasePriceFromMarketValue
Namespace Prefix:	stra_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum number of shares made available for purchase by participating employees under employee stock purchase plan.

+ References

No definition available.

+ Details

Name:	stra_MaximumNumberOfSharesMadeAvailableForPurchaseByParticipatingEmployeesUnderEmployeeStockPurchasePlan
Namespace Prefix:	stra_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

The additional percent of the employer's matching of employee deferrals.

+ References

No definition available.

+ Details

Name:	stra_PercentageOfEmployersAdditionalMatchingContributionTowardsPlan
Namespace Prefix:	stra_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(4)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration