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Stock Options, Restricted Stock and Restricted Stock Units (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule of stock-based compensation expense    
Stock-based compensation expense included in operating expense $ 2,451us-gaap_ShareBasedCompensation $ 1,961us-gaap_ShareBasedCompensation
Tax benefit 956us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 781us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Stock-based compensation expense, net of income tax 1,495us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 1,180us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Instruction and educational support [Member]    
Schedule of stock-based compensation expense    
Stock-based compensation expense included in operating expense 367us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= stra_InstructionAndEducationalSupportMember
434us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= stra_InstructionAndEducationalSupportMember
Marketing [Member]    
Schedule of stock-based compensation expense    
Stock-based compensation expense included in operating expense      
Admissions advisory [Member]    
Schedule of stock-based compensation expense    
Stock-based compensation expense included in operating expense      
General and administration [Member]    
Schedule of stock-based compensation expense    
Stock-based compensation expense included in operating expense $ 2,084us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
$ 1,527us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember