Concentration - Narrative (Details)	Dec. 31, 2018
Risks and Uncertainties [Abstract]
Percentage of students	55.00%

Percentage Of Students Served In Military On Active Duty At Time Of Initial Enrollment

No definition available.

Name:	apei_PercentageOfStudentsServedInMilitaryOnActiveDutyAtTimeOfInitialEnrollment
Namespace Prefix:	apei_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant