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Significant Accounting Policies (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Significant Accounting Policies (Textual) |  |  |
Percentage of tuition revenue in total revenue | 96.00%stra_PercentageOfTuitionRevenueInRevenue |  |
Unused books and academic meterial refunadable period | 21 days |  |
Restricted cash | $ 200,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue |  |
Tuition receivable included in other assets | 1,600,000 us-gaap_AccountsReceivableNetNoncurrent | 3,400,000 us-gaap_AccountsReceivableNetNoncurrent |
Expected collection period of tuition receivable | After 12 months. |  |
Minimum protective endowment | 500,000 us-gaap_RestrictedCashAndCashEquivalentsNoncurrent |  |
Common stock, shares authorized | 20,000,000 us-gaap_CommonStockSharesAuthorized | 20,000,000 us-gaap_CommonStockSharesAuthorized |
Common stock, par value | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |
Common stock, shares issued | 10,903,341 us-gaap_CommonStockSharesIssued | 10,797,464 us-gaap_CommonStockSharesIssued |
Common stock, shares outstanding | 10,903,341 us-gaap_CommonStockSharesOutstanding | 10,797,464 us-gaap_CommonStockSharesOutstanding |
Preferred stock, shares authorized | 8,000,000 us-gaap_PreferredStockSharesAuthorized |  |
Preferred stock, shares issued |  |  |
Preferred stock, shares outstanding |  |  |
Income tax description | Upon determination, uncertain tax positions are measured to determine the amount of benefit that is greater than 50% likely to be realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. A tax position is derecognized if it no longer meets the more likely than not threshold of being sustained. |  |
Depreciation and amortization | 20,630,000 us-gaap_DepreciationAndAmortization | 35,563,000 us-gaap_DepreciationAndAmortization | 23,973,000 us-gaap_DepreciationAndAmortization
Impairment loss |  |  |
Maximum [Member] |  |  |
Significant Accounting Policies (Textual) |  |  |
Estimated useful life of property and equipment | 40 years |  |
Minimum [Member] |  |  |
Significant Accounting Policies (Textual) |  |  |
Estimated useful life of property and equipment | 3 years |  |

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