Segment Reporting - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Sep. 30, 2018 Student Cmp	Sep. 30, 2018 Segment Student
Segment Reporting Information [Line Items]
Number of reporting segments | Segment		3
CTU [Member]
Segment Reporting Information [Line Items]
Students enrolled expressed as percentage of enrollment	64.00%	64.00%
CTU [Member] | Fully Online [Member]
Segment Reporting Information [Line Items]
Percentage of enrollment	93.00%	93.00%
AIU [Member]
Segment Reporting Information [Line Items]
Students enrolled expressed as percentage of enrollment	36.00%	36.00%
AIU [Member] | Fully Online [Member]
Segment Reporting Information [Line Items]
Percentage of enrollment	94.00%	94.00%
All Other Campuses [Member]
Segment Reporting Information [Line Items]
Number of students enrolled at campuses | Student	10	10
Number of campuses completed teach out activities | Cmp	1