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Property and Equipment - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Property, Plant and Equipment [Line Items] |  |  |
Depreciation and amortization expense including assets under capital lease | $ 21,264 | $ 16,339 | $ 11,376

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- Definition Depreciation and Amortization Including Assets Under Capital Lease. + References No definition available. + Details
Name: | lope_DepreciationAndAmortizationIncludingAssetsUnderCapitalLease
Namespace Prefix: | lope_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration