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Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statements of Income [Abstract]
Revenues	$ 446,041us-gaap_SalesRevenueServicesNet	$ 503,600us-gaap_SalesRevenueServicesNet	$ 561,979us-gaap_SalesRevenueServicesNet
Costs and expenses:
Instruction and educational support	236,303us-gaap_CostOfServices	310,446us-gaap_CostOfServices	300,098us-gaap_CostOfServices
Marketing	66,495us-gaap_SellingAndMarketingExpense	75,426us-gaap_SellingAndMarketingExpense	71,864us-gaap_SellingAndMarketingExpense
Admissions advisory	16,661stra_AdmissionsAdvisory	20,390stra_AdmissionsAdvisory	26,374stra_AdmissionsAdvisory
General and administration	44,835us-gaap_GeneralAndAdministrativeExpense	64,637us-gaap_GeneralAndAdministrativeExpense	50,056us-gaap_GeneralAndAdministrativeExpense
Total costs and expenses	364,294us-gaap_CostsAndExpenses	470,899us-gaap_CostsAndExpenses	448,392us-gaap_CostsAndExpenses
Income from operations	81,747us-gaap_OperatingIncomeLoss	32,701us-gaap_OperatingIncomeLoss	113,587us-gaap_OperatingIncomeLoss
Investment income	117us-gaap_InvestmentIncomeNonoperating	2us-gaap_InvestmentIncomeNonoperating	4us-gaap_InvestmentIncomeNonoperating
Interest expense	5,248us-gaap_InterestExpense	5,419us-gaap_InterestExpense	4,616us-gaap_InterestExpense
Income before income taxes	76,616us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	27,284us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	108,975us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes	30,260us-gaap_IncomeTaxExpenseBenefit	10,859us-gaap_IncomeTaxExpenseBenefit	43,045us-gaap_IncomeTaxExpenseBenefit
Net income	$ 46,356us-gaap_NetIncomeLoss	$ 16,425us-gaap_NetIncomeLoss	$ 65,930us-gaap_NetIncomeLoss
Earnings per share:
Basic	$ 4.39us-gaap_EarningsPerShareBasic	$ 1.55us-gaap_EarningsPerShareBasic	$ 5.79us-gaap_EarningsPerShareBasic
Diluted	$ 4.35us-gaap_EarningsPerShareDiluted	$ 1.55us-gaap_EarningsPerShareDiluted	$ 5.76us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding:
Basic	10,561us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	10,584us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	11,390us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	10,650us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	10,624us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	11,440us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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