Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total Revenue	$ 150,838	$ 149,535	$ 447,741	$ 453,890
Instructional services, net of grants and scholarships
Disaggregation of Revenue [Line Items]
Total Revenue	140,001	136,608	413,676	414,576
Graduation fees
Disaggregation of Revenue [Line Items]
Total Revenue	381	374	1,138	1,089
Textbook and other course materials
Disaggregation of Revenue [Line Items]
Total Revenue	9,503	11,445	30,098	34,823
Other fees
Disaggregation of Revenue [Line Items]
Total Revenue	953	1,108	2,829	3,402
Corporate and Other
Disaggregation of Revenue [Line Items]
Total Revenue	8,618	7,843	21,142	15,187
Corporate and Other | Instructional services, net of grants and scholarships
Disaggregation of Revenue [Line Items]
Total Revenue	8,618	7,843	21,142	15,187
Corporate and Other | Graduation fees
Disaggregation of Revenue [Line Items]
Total Revenue	0	0	0	0
Corporate and Other | Textbook and other course materials
Disaggregation of Revenue [Line Items]
Total Revenue	0	0	0	0
Corporate and Other | Other fees
Disaggregation of Revenue [Line Items]
Total Revenue	0	0	0	0
APUS | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenue	76,406	68,735	223,941	211,729
APUS | Operating Segments | Instructional services, net of grants and scholarships
Disaggregation of Revenue [Line Items]
Total Revenue	75,879	68,173	222,224	210,094
APUS | Operating Segments | Graduation fees
Disaggregation of Revenue [Line Items]
Total Revenue	381	374	1,138	1,089
APUS | Operating Segments | Textbook and other course materials
Disaggregation of Revenue [Line Items]
Total Revenue	0	0	0	0
APUS | Operating Segments | Other fees
Disaggregation of Revenue [Line Items]
Total Revenue	146	188	579	546
RU | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenue	52,073	61,548	161,511	192,538
RU | Operating Segments | Instructional services, net of grants and scholarships
Disaggregation of Revenue [Line Items]
Total Revenue	43,743	50,973	135,452	160,213
RU | Operating Segments | Graduation fees
Disaggregation of Revenue [Line Items]
Total Revenue	0	0	0	0
RU | Operating Segments | Textbook and other course materials
Disaggregation of Revenue [Line Items]
Total Revenue	7,707	9,814	24,304	29,906
RU | Operating Segments | Other fees
Disaggregation of Revenue [Line Items]
Total Revenue	623	761	1,755	2,419
HCN | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenue	13,741	11,409	41,147	34,436
HCN | Operating Segments | Instructional services, net of grants and scholarships
Disaggregation of Revenue [Line Items]
Total Revenue	11,761	9,619	34,858	29,082
HCN | Operating Segments | Graduation fees
Disaggregation of Revenue [Line Items]
Total Revenue	0	0	0	0
HCN | Operating Segments | Textbook and other course materials
Disaggregation of Revenue [Line Items]
Total Revenue	1,796	1,631	5,794	4,917
HCN | Operating Segments | Other fees
Disaggregation of Revenue [Line Items]
Total Revenue	$ 184	$ 159	$ 495	$ 437