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Other Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Maximum annual contribution to 401(k) plan by employees	$ 17,000
Percentage of company matching contribution to 401(K) plan	100.00%
Defined contribution plan employer matching contribution percent	3.00%
Percentage of company additional matching contribution to 401(k) plan	50.00%
Company's contributions to 401(K) plan	$ 2,700,000	$ 2,300,000	$ 1,800,000
Purchase price to its market value	90.00%
Purchase limitation of an employee's eligible compensation	10.00%
Maximum number of shares available for purchase by participating employees	2,500,000
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of company additional matching contribution to 401(k) plan	3.00%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of company additional matching contribution to 401(k) plan	5.00%

X

- Definition

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 percent of the employer's matching of employee deferrals.

+ References

No definition available.

+ Details

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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

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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

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Namespace Prefix:	stra_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	stra_
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Balance Type:	na
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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=6962843&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=6962843&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=6962843&loc=d3e1928-114920

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