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Significant Accounting Policies (Schedule Of Company's Operating Expenses As Previously Reported) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010 As Reported [Member]		Sep. 30, 2010 As Reported [Member]		Jun. 30, 2010 As Reported [Member]		Mar. 31, 2010 As Reported [Member]		Dec. 31, 2010 As Reclassified [Member]		Sep. 30, 2010 As Reclassified [Member]		Jun. 30, 2010 As Reclassified [Member]		Mar. 31, 2010 As Reclassified [Member]
Significant Accounting Policies [Line Items]
Percentage of tuition revenue to total revenue			98.00%
Instruction and educational support	$ 68,170	$ 65,759	$ 219,519	$ 195,404	$ 57,111		$ 49,023		$ 50,101		$ 48,977		$ 74,153		$ 65,759		$ 66,261		$ 63,384
Marketing	23,351	23,621	55,634	51,933	29,802	[1]	34,735	[1]	24,882	[1]	24,745	[1]	18,337	[1]	23,621	[1]	14,461	[1]	13,851	[1]
Admissions advisory	6,533	6,583	20,174	18,693									6,584		6,583		6,061		6,049
General and administration	13,406	13,385	42,508	41,885	26,133		25,590		25,609		24,253		13,972		13,385		13,809		14,691
Operating expenses					$ 113,046		$ 109,348		$ 100,592		$ 97,975		$ 113,046		$ 109,348		$ 100,592		$ 97,975
[1] This line item was labeled Marketing and admissions expense on an "as reported" basis in 2010. Marketing and admissions expenses related to student support services were reclassified to Instruction and educational support expense, those related to admissions to Admissions advisory, and those related to corporate overhead were reclassified to General and administration expense in 2010.

X

- Definition

Includes salaries, benefits, and related costs of personnel engaged in admissions.

+ Details

Name:	stra_AdmissionsAdvisory
Namespace Prefix:	stra
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of tuition revenue to total revenue.

+ Details

Name:	stra_PercentageOfTuitionRevenueToTotalRevenue
Namespace Prefix:	stra
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Significant Accounting Policies [Line Items]

+ Details

Name:	stra_SignificantAccountingPoliciesLineItems
Namespace Prefix:	stra
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Total costs related to services rendered by an entity during the reporting period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 2



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(d))

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details

Name:	us-gaap_CostOfServices
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details

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

X

- Definition

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

+ Details

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

X

- Definition

The aggregate total amount of expenses directly related to the marketing or selling of products or services.

+ Details

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