XML 36 R25.htm IDEA: XBRL DOCUMENT v3.7.0.1

Nature of Business - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2017 Degrees Colleges
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of area of the company's campus in Phoenix, Arizona	270 acre campus
Number of colleges in Phoenix, Arizona | Colleges	9
Number of degree programs and certificates | Degrees	220

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