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Term Loan and Revolving Credit Facility (Details Textual) (USD $)	1 Months Ended	3 Months Ended
	Nov. 30, 2012	Mar. 31, 2015	Mar. 31, 2014	Nov. 08, 2012
Term Loan and Revolving Credit Facility (Textual)
Maturity date	Dec. 31, 2016
Debt		$ 117,188,000us-gaap_LongTermDebt
Term loan facility, quarterly amortization payments, during 2013				781,250stra_TermLoanFacilityAmortizationPaymentsYearOne
Term loan facility, quarterly amortization payments, during 2014				781,250stra_TermLoanFacilityAmortizationPaymentsYearTwo
Term loan facility, quarterly amortization payments, during 2015				1,562,500stra_TermLoanFacilityAmortizationPaymentsYearThree
Term loan facility, quarterly amortization payments, during 2016				1,562,500stra_TermLoanFacilityAmortizationPaymentsYearFour
Quarterly payment percentage of aggregate original principal amount of term loan facility in year one and two				0.625%stra_PaymentPercentageOfAggregateOriginalPrincipalAmountOfTermLoanFacilityInYearOneAndTwo
Quarterly payment percentage of aggregate original principal amount of term loan facility in year three and four				1.25%stra_PaymentPercentageOfAggregateOriginalPrincipalAmountOfTermLoanFacilityInYearThreeAndFour
Cash interest paid		1,100,000us-gaap_InterestPaid	1,200,000us-gaap_InterestPaid
Covenant terms required by credit facility		a leverage ratio of not greater than 2 to 1. Leverage ratio is defined as the ratio of total debt to trailing four-quarter EBITDA (earnings before interest, taxes, depreciation, amortization and non-cash charges such as stock-based compensation). a coverage ratio of not less than 1.75 to 1. Coverage ratio is defined as the ratio of trailing four-quarter EBITDA and rent expense to trailing four-quarter interest and rent expense. a Department of Education Financial Responsibility Composite Score of not less than 1.5.
Maximum total leverage ratio		2stra_MaximumLeverageRatioToBeMaintainedUnderCreditFacility
Minimum coverage ratio		1.75stra_MinimumCoverageRatioToBeMaintainedUnderCreditFacility
Minimum department of education financial composite score		1.5stra_MinimumDepartmentOfEducationFinancialCompositeScoreToBeMaintainedUnderCreditFacility
Revolving Credit Facility [Member]
Term Loan and Revolving Credit Facility (Textual)
Revolving credit facility, value				100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
Option to increase commitments under credit facility				50,000,000stra_OptionToIncreaseCommitmentsUnderCreditFacility / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
Revolving credit facility, outstanding				0us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
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] | 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] | Minimum [Member] | Base Rate [Member]
Term Loan and Revolving Credit Facility (Textual)
Margin rate for interest if using base rate		2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember
Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]
Term Loan and Revolving Credit Facility (Textual)
Margin rate for interest if using base rate		2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember
Revolving Credit Facility [Member] | Letter of Credit [Member]
Term Loan and Revolving Credit Facility (Textual)
Option to increase commitments under credit facility				50,000,000stra_OptionToIncreaseCommitmentsUnderCreditFacility / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_LetterOfCreditMember
Term Loan Facility [Member]
Term Loan and Revolving Credit Facility (Textual)
Revolving credit facility, value				125,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = stra_TermLoanFacilityMember
Debt		$ 117,200,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = stra_TermLoanFacilityMember
Term Loan Facility [Member] | Interest Rate Swap [Member]
Term Loan and Revolving Credit Facility (Textual)
Interest rate swap, fixed rate minimum		2.85%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum / us-gaap_DebtInstrumentAxis = stra_TermLoanFacilityMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Interest rate swap, fixed rate maximum		3.35%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = stra_TermLoanFacilityMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Term Loan Facility [Member] | Minimum [Member]
Term Loan and Revolving Credit Facility (Textual)
Unused commitment fee		0.30%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = stra_TermLoanFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Term Loan Facility [Member] | Maximum [Member]
Term Loan and Revolving Credit Facility (Textual)
Unused commitment fee		0.40%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = stra_TermLoanFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- 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
Balance Type:	na
Period Type:	instant

X

- Definition

Minimum coverage ratio to be maintained under credit facility.

+ References

No definition available.

+ Details

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

X

- 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
Balance Type:	na
Period Type:	instant

X

- 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

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

X

- 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
Balance Type:	na
Period Type:	instant

X

- 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_
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X

- Details

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

X

- 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

X

- Definition

Term Loan Facility, Quarterly Amortization Payments, year one.

+ References

No definition available.

+ Details

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

X

- 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

X

- 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

X

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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 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_
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Balance Type:	na
Period Type:	duration

X

- 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

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 210.5-02.22(a)(1))

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

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

X

- 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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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585

+ Details

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

X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: 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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5



Reference 3: 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

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

X

- 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

+ Details

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

X

- Definition

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

+ 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

+ Details

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

X

- 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

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

+ Details

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

X

- 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

X

- 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 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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Name Accounting Standards Codification

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-Paragraph 1

-Subparagraph (SX 210.7-03.16)

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



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

+ Details

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Period Type:	instant

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- Details

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- Details

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