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Share-Based Compensation Plans - Summary of Activity Related to Stock Options Granted Under Company's Incentive Plan (Parenthetical) (Detail) (USD $)	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of closing stock price	$ (23.47)

X

- Definition

Value of closing stock price.

+ References

No definition available.

+ Details

Name:	lope_ValueOfClosingStockPrice
Namespace Prefix:	lope_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration