Segment Reporting - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2019 Segment
Segment Reporting Information [Line Items]
Number of reporting segments	2
CTU [Member]
Segment Reporting Information [Line Items]
Students enrolled expressed as percentage of enrollment	62.00%
CTU [Member] | Fully Online [Member]
Segment Reporting Information [Line Items]
Percentage of enrollment	94.00%
AIU [Member]
Segment Reporting Information [Line Items]
Students enrolled expressed as percentage of enrollment	38.00%
AIU [Member] | Fully Online [Member]
Segment Reporting Information [Line Items]
Percentage of enrollment	94.00%