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

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- Definition Campus location closed. + References No definition available. + Details
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- Definition Number Of Long Term Non Cancelable Operating Leases. + References No definition available. + Details
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- Definition Reduction of the liability for losses on facilities no longer in use. + References No definition available. + Details
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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 + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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