XML 36 R62.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Regulatory - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Loss Contingencies [Line Items] |  |  |
Pell grants returns reserve | $ 3,450 |  |
Revenue from Title IV program funds | 80.30% | 80.20% | 84.90%

X
- Definition Ninety By Ten Revenue Test + References No definition available. + Details
Name: | lope_NinetyByTenRevenueTest
Namespace Prefix: | lope_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reserve for estimated loss. + References No definition available. + Details
Name: | lope_ReserveForEstimatedLoss
Namespace Prefix: | lope_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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