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Capital Lease Obligations - Components of Capital Lease Obligations (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Capital Lease Obligations [Line Items]
Monthly payments on capital leases	$ 8
Implicit interest rate on capital leases, Maximum	2.20%

X

- Definition

Capital lease interest rate stated percentage rate range maximum.

+ References

No definition available.

+ Details

Name:	lope_CapitalLeaseInterestRateStatedPercentageRateRangeMaximum
Namespace Prefix:	lope_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	lope_CapitalLeaseObligationsLineItems
Namespace Prefix:	lope_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Monthly payments on capital leases.

+ References

No definition available.

+ Details

Name:	lope_MonthlyPaymentsOnCapitalLeases
Namespace Prefix:	lope_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant