A letter of credit subfacility included in the revolving credit facility.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum leverage ratio to be maintained under credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	stra_
Data Type:	xbrli:pureItemType
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- Definition

Minimum coverage ratio to be maintained under credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	stra_
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Period Type:	instant

- Definition

Minimum department of education financial composite score to be maintained under credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	stra_
Data Type:	xbrli:pureItemType
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Period Type:	instant

- Definition

The additional amount by which the Company can increase its commitments under the Credit Facility, subject to obtaining additional loan commitments and the satisfaction of certain conditions.

+ References

No definition available.

+ Details

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

- Definition

The percentage of the aggregate original principal amount of the term loan facility that is paid quarterly in year one and two.

+ References

No definition available.

+ Details

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Namespace Prefix:	stra_
Data Type:	num:percentItemType
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Period Type:	instant

- Definition

The percentage of the aggregate original principal amount of the term loan facility that is paid quarterly in year three and four.

+ References

No definition available.

+ Details

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

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Term Loan Facility, Quarterly Amortization Payments, year four.

+ References

No definition available.

+ Details

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

- Definition

Term Loan Facility, Quarterly Amortization Payments, year one.

+ References

No definition available.

+ Details

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

- Definition

Term Loan Facility, Quarterly Amortization Payments, year three.

+ References

No definition available.

+ Details

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

- Definition

Term Loan Facility, Quarterly Amortization Payments, year two.

+ References

No definition available.

+ Details

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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

- Definition

The average effective interest rate during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

+ Details

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

- Definition

The amount of cash paid for interest during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

+ Details

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

- Definition

Description of the conditions for borrowing under the credit facility including the nature of any restrictions.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Term Loan and Revolving Credit Facility (Details Textual) (USD $)	1 Months Ended	12 Months Ended
	Nov. 30, 2012	Dec. 31, 2013	Nov. 08, 2012
Term Loan and Revolving Credit Facility (Textual)
Maturity date	Dec. 31, 2016
Long term debt		$ 121,875,000
Term loan facility, quarterly amortization payments, during 2013			781,250
Term loan facility, quarterly amortization payments, during 2014			781,250
Term loan facility, quarterly amortization payments, during 2015			1,562,500
Term loan facility, quarterly amortization payments, during 2016			1,562,500
Quarterly payment percentage of aggregate original principal amount of term loan facility in year one and two			0.625%
Quarterly payment percentage of aggregate original principal amount of term loan facility in year three and four			1.25%
Cash interest paid		4,600,000
Average annual interest rate		4.40%
Covenant terms required by credit facility		1) A total leverage ratio of not greater than 2.00:1.00; 2) A coverage ratio of not less than 1.75:1.00; 3) A Department of Education financial composite score of not less than 1.5.
Maximum total leverage ratio		2.00
Minimum coverage ratio		1.75
Minimum department of education financial composite score		1.5
Revolving Credit Facility [Member]
Term Loan and Revolving Credit Facility (Textual)
Revolving credit facility, value			100,000,000
Long term debt
Option to increase commitments under credit facility			50,000,000
Revolving Credit Facility [Member] \| Base Rate [Member]
Term Loan and Revolving Credit Facility (Textual)
Debt instrument description of variable rate basis		base rate
Revolving Credit Facility [Member] \| Base Rate [Member] \| Minimum [Member]
Term Loan and Revolving Credit Facility (Textual)
Margin rate for interest if using base rate		2.00%
Revolving Credit Facility [Member] \| Base Rate [Member] \| Maximum [Member]
Term Loan and Revolving Credit Facility (Textual)
Margin rate for interest if using base rate		2.50%
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Term Loan and Revolving Credit Facility (Textual)
Debt instrument description of variable rate basis		LIBOR
Revolving Credit Facility [Member] \| Letter of Credit [Member]
Term Loan and Revolving Credit Facility (Textual)
Letter of credit subfacility			50,000,000
Term Loan Facility [Member]
Term Loan and Revolving Credit Facility (Textual)
Revolving credit facility, value			125,000,000
Long term debt		$ 121,875,000
Term Loan Facility [Member] \| Minimum [Member]
Term Loan and Revolving Credit Facility (Textual)
Unused commitment fee		0.30%
Term Loan Facility [Member] \| Maximum [Member]
Term Loan and Revolving Credit Facility (Textual)
Unused commitment fee		0.40%
Term Loan Facility [Member] \| Interest Rate Swap [Member]
Term Loan and Revolving Credit Facility (Textual)
Interest rate swap, fixed rate minimum		2.85%
Interest rate swap, fixed rate maximum		3.35%