XML 58 R38.htm IDEA: XBRL DOCUMENT v3.3.1.900

Nature of Business - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 Degrees Colleges
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of area of the company's campus in Phoenix, Arizona	200+ acre campus
Number of colleges in Phoenix, Arizona | Colleges	8
Number of degree programs and certificates | Degrees	200

X

- Definition

Number of colleges.

+ References

No definition available.

+ Details

Name:	lope_NumberOfColleges
Namespace Prefix:	lope_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of degree programs offered.

+ References

No definition available.

+ Details

Name:	lope_NumberOfDegreeProgramsOffered
Namespace Prefix:	lope_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Real estate property description.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration