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Term Loan and Revolving Credit Facility (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of debt and short-term borrowings    
Total debt $ 118,750us-gaap_LongTermDebt  
Less: Current portion of long-term debt 6,250us-gaap_LongTermDebtCurrent 3,125us-gaap_LongTermDebtCurrent
Long-term debt 112,500us-gaap_LongTermDebtNoncurrent 118,750us-gaap_LongTermDebtNoncurrent
Term loan [Member]    
Schedule of debt and short-term borrowings    
Total debt 118,750us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= stra_TermLoanFacilityMember
 
Revolving credit facility [Member]    
Schedule of debt and short-term borrowings    
Total debt