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Capital Lease Obligations - Components of Capital Lease Obligations (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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

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

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- 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