Nature of Business (Details)	12 Months Ended
Dec. 31, 2019 subsidiary student campus segment
Segment Reporting Information [Line Items]
Number of students \| student	82,600
Number of subsidiary institutions \| subsidiary	2
Number of reportable segments \| segment	2
HCN
Segment Reporting Information [Line Items]
Number of campuses \| campus	5

The number of students with either an academic status of Active or Program Hold and who are currently in a course or completed a course in the last 12 months; or the number of students enrolled in one or more courses after the date by which they may drop the course without financial penalty.

No definition available.

Name:	apei_NumberOfStudents
Namespace Prefix:	apei_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration