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Nature of Business - Additional Information (Detail) | Dec. 31, 2012 acre
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Nature Of Operations [Line Items] |
Area of the Company's campus in Phoenix, Arizona | 115

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- Definition Area of the company's campus. + References No definition available. + Details
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Namespace Prefix: | lope_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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