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Consolidated Income Statements (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Net revenue	$ 194,127us-gaap_SalesRevenueNet	$ 167,432us-gaap_SalesRevenueNet
Costs and expenses:
Instructional costs and services	78,687lope_InstructionalCostsAndServices	70,678lope_InstructionalCostsAndServices
Admissions advisory and related, including $505 and $805 to related parties for the three months ended March 31, 2015 and 2014, respectively	28,333lope_AdmissionsAdvisoryAndRelatedExpenses	26,261lope_AdmissionsAdvisoryAndRelatedExpenses
Advertising	20,031us-gaap_AdvertisingExpense	16,712us-gaap_AdvertisingExpense
Marketing and promotional	1,694us-gaap_MarketingExpense	1,791us-gaap_MarketingExpense
General and administrative	9,396us-gaap_GeneralAndAdministrativeExpense	8,554us-gaap_GeneralAndAdministrativeExpense
Total costs and expenses	138,141us-gaap_CostsAndExpenses	123,996us-gaap_CostsAndExpenses
Operating income	55,986us-gaap_OperatingIncomeLoss	43,436us-gaap_OperatingIncomeLoss
Interest expense	(375)us-gaap_InterestExpense	(523)us-gaap_InterestExpense
Interest and other income	257us-gaap_InvestmentIncomeNonoperating	137us-gaap_InvestmentIncomeNonoperating
Income before income taxes	55,868us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	43,050us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense	21,689us-gaap_IncomeTaxExpenseBenefit	16,762us-gaap_IncomeTaxExpenseBenefit
Net income	$ 34,179us-gaap_NetIncomeLoss	$ 26,288us-gaap_NetIncomeLoss
Earnings per share:
Basic income per share	$ 0.75us-gaap_EarningsPerShareBasic	$ 0.58us-gaap_EarningsPerShareBasic
Diluted income per share	$ 0.72us-gaap_EarningsPerShareDiluted	$ 0.56us-gaap_EarningsPerShareDiluted
Basic weighted average shares outstanding	45,789us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	45,205us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted average shares outstanding	47,201us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	46,841us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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Costs directly attributable to educational services, including salaries and benefits for full-time faculty, administrators and academic advisors, and costs associated with adjunct faculty. Also includes costs for educational supplies such as books, costs associated with academic records and graduation, costs associated with collections from our students such as bad debt expense, and other university services such as evaluating transcripts.

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