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Significant Accounting Policies (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
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   $ 0.2us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Tuition receivable included in other assets 1.7us-gaap_AccountsReceivableNetNoncurrent 1.6us-gaap_AccountsReceivableNetNoncurrent
Expected collection period of tuition receivable After 12 months  
Minimum protective endowment   $ 0.5us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Common stock, shares authorized 20,000,000us-gaap_CommonStockSharesAuthorized 20,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares issued 10,974,034us-gaap_CommonStockSharesIssued 10,903,341us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 10,974,034us-gaap_CommonStockSharesOutstanding 10,903,341us-gaap_CommonStockSharesOutstanding
Preferred stock, shares authorized 8,000,000us-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.