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Significant Accounting Policies (Details Textual) (USD $)
 12 Months Ended
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 $ 200,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue    
Tuition receivable included in other assets 1,600,000us-gaap_AccountsReceivableNetNoncurrent 3,400,000us-gaap_AccountsReceivableNetNoncurrent  
Expected collection period of tuition receivable After 12 months.    
Minimum protective endowment 500,000us-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 10,903,341us-gaap_CommonStockSharesIssued 10,797,464us-gaap_CommonStockSharesIssued  
Common stock, shares outstanding 10,903,341us-gaap_CommonStockSharesOutstanding 10,797,464us-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.    
Depreciation and amortization 20,630,000us-gaap_DepreciationAndAmortization 35,563,000us-gaap_DepreciationAndAmortization 23,973,000us-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