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Unaudited Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statements of Income [Abstract]
Revenues	$ 111,885us-gaap_SalesRevenueServicesNet	$ 116,468us-gaap_SalesRevenueServicesNet
Costs and expenses:
Instruction and educational support	59,697us-gaap_CostOfServices	59,113us-gaap_CostOfServices
Marketing	16,681us-gaap_SellingAndMarketingExpense	16,314us-gaap_SellingAndMarketingExpense
Admissions advisory	3,993stra_AdmissionsAdvisory	4,119stra_AdmissionsAdvisory
General and administration	11,655us-gaap_GeneralAndAdministrativeExpense	11,013us-gaap_GeneralAndAdministrativeExpense
Total costs and expenses	92,026us-gaap_CostsAndExpenses	90,559us-gaap_CostsAndExpenses
Income from operations	19,859us-gaap_OperatingIncomeLoss	25,909us-gaap_OperatingIncomeLoss
Investment income	78us-gaap_InvestmentIncomeNonoperating	1us-gaap_InvestmentIncomeNonoperating
Interest expense	1,273us-gaap_InterestExpense	1,353us-gaap_InterestExpense
Income before income taxes	18,664us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	24,557us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes	7,279us-gaap_IncomeTaxExpenseBenefit	9,774us-gaap_IncomeTaxExpenseBenefit
Net income	$ 11,385us-gaap_NetIncomeLoss	$ 14,783us-gaap_NetIncomeLoss
Earnings per share:
Basic	$ 1.08us-gaap_EarningsPerShareBasic	$ 1.40us-gaap_EarningsPerShareBasic
Diluted	$ 1.06us-gaap_EarningsPerShareDiluted	$ 1.40us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding:
Basic	10,579us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	10,529us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	10,738us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	10,581us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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