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Regulation (Details)
 12 Months Ended
Dec. 31, 2014
Regulation Textual [Abstract]  
Average of median annual earning percentage 8.00%stra_AverageOfMedianAnnualEarningPercentage
Average of median discretionary percentage 20.00%stra_AverageOfMedianDiscretionaryPercentage
Debt to earnings rates description A program would fail if the program's graduates have an annual income rate of 12% or greater and a discretionary income rate of 30% or greater.
Maximum [Member]  
Regulation Textual [Abstract]  
Average of median annual earning percentage 12.00%stra_AverageOfMedianAnnualEarningPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Average of median discretionary percentage 30.00%stra_AverageOfMedianDiscretionaryPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Minimum [Member]  
Regulation Textual [Abstract]  
Average of median annual earning percentage 8.00%stra_AverageOfMedianAnnualEarningPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Average of median discretionary percentage 20.00%stra_AverageOfMedianDiscretionaryPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember