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Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Lease	Dec. 31, 2013 Campus	Dec. 31, 2012
Commitments and Contingencies [Abstract]
Number of long-term, non-cancelable operating leases	93stra_NumberOfLongTermNonCancelableOperatingLeases
Rent expense	$ 35.7us-gaap_OperatingLeasesRentExpenseNet	$ 82.2us-gaap_OperatingLeasesRentExpenseNet	$ 46.5us-gaap_OperatingLeasesRentExpenseNet
Charges related to the closure of campuses and other administrative facilities		36.0us-gaap_OtherRestructuringCosts
Campus location closed		20stra_CampusLocationClosed
Reduction of liability	$ 4.1stra_ReductionOfLiabilityForLossesOnFacilitiesNoLongerInUse

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- Definition

Campus location closed.

+ References

No definition available.

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- Definition

Number Of Long Term Non Cancelable Operating Leases.

+ References

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- Definition

Reduction of the liability for losses on facilities no longer in use.

+ References

No definition available.

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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- Definition

Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747



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-Name Accounting Standards Codification

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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