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Other Long-Term Liabilities (Details Textual) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jun. 30, 2007 Asset | Mar. 31, 2014
Other Long -Term Liabilities (Textual) |  |
Sale price of one of campus buildings | $ 5.8 |
Sale and lease back term for most of the campus building | 10 years |
Gain on sale and lease back of one of campus buildings before tax | 2.8 |
Funds received from investor |  | $ 2.8
Sale and lease back term | 10 years |
Number of assets sold | 1 |
Minimum [Member] |  |
Other Long -Term Liabilities (Textual) |  |
Leasehold improvements and long-term liability amortization period |  | 5 years
Maximum [Member] |  |
Other Long -Term Liabilities (Textual) |  |
Leasehold improvements and long-term liability amortization period |  | 10 years

X
- Definition Seller's contribution to the Company representing the seller's continuing interest in the assets acquired. + References No definition available. + Details
Name: | stra_FundsReceivedFromInvestor
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Leasehold improvements, long term liability amortization period. + References No definition available. + Details
Name: | stra_LeaseholdImprovementsLongTermLiabilityAmortizationPeriod
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | stra_OtherLongTermLiabilitiesTextualAbstract
Namespace Prefix: | stra_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the lease term of the asset leased back in a sale and lease back transaction. + References No definition available. + Details
Name: | stra_SaleLeaseBackTransactionLeaseTermOne
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of assets sold in a sale lease back transaction. + References No definition available. + Details
Name: | stra_SaleLeaseBackTransactionNumberOfAssetsSold
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the gain recorded in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller to be recognized in future periods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6456126&loc=d3e49567-112750 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The gross proceeds received from the asset(s) sold in connection with the transaction involving the sale of property to another party and the lease back to the seller. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757 + Details
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Balance Type: | debit
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- Definition A description of the terms of the lease(s) related to the assets being leased-back in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6456341&loc=d3e50796-112755 + Details
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