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Other Long-Term Liabilities (Details Textual) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Jun. 30, 2007 Asset	Dec. 31, 2014
Other Long -Term Liabilities (Textual)
Sale price of one of campus buildings	$ 5.8us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities
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	2.8us-gaap_SaleLeasebackTransactionDeferredGainGross
Funds received from investor		$ 2.8stra_FundsReceivedFromInvestor
Sale and lease back term	10 years
Number of assets sold	1stra_SaleLeaseBackTransactionNumberOfAssetsSold
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.

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- Definition

Leasehold improvements, long term liability amortization period.

+ References

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- Details

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- Definition

Represents the lease term of the asset leased back in a sale and lease back transaction.

+ References

No definition available.

+ Details

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- Definition

Represents the number of assets sold in a sale lease back transaction.

+ References

No definition available.

+ Details

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- 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

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- Definition

Amount of cash inflow before closing and deferred financing costs received by a seller-lessee in a sale-leaseback recognized in investing activities.

+ 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



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-Name Accounting Standards Codification

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-Section 55

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757



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-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

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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



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