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Share-Based Compensation Plans - Share-Based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation expense $ 9,945us-gaap_AllocatedShareBasedCompensationExpense $ 9,936us-gaap_AllocatedShareBasedCompensationExpense $ 7,811us-gaap_AllocatedShareBasedCompensationExpense
Tax effect of share-based compensation (3,978)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense (3,974)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense (3,124)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Share-based compensation expense, net of tax 5,967us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 5,962us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 4,687us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Instructional Costs and Services [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation expense 5,921us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= lope_InstructionalCostsAndServicesMember		 5,246us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= lope_InstructionalCostsAndServicesMember		 3,809us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= lope_InstructionalCostsAndServicesMember
Admissions Advisory and Related [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation expense 166us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= lope_AdvisoryServicesMember		 134us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= lope_AdvisoryServicesMember		 224us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= lope_AdvisoryServicesMember
Marketing and Promotional [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation expense 220us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember		 229us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember		 169us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember
General and Administrative [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation expense $ 3,638us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 $ 4,327us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 $ 3,609us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember