Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Total Revenue	$ 147,214	$ 149,608	$ 296,903	$ 304,355
Instructional services, net of grants and scholarships
Disaggregation of Revenue [Line Items]
Total Revenue	135,972	136,716	273,675	277,968
Graduation fees
Disaggregation of Revenue [Line Items]
Total Revenue	388	380	757	715
Textbook and other course materials
Disaggregation of Revenue [Line Items]
Total Revenue	9,894	11,421	20,595	23,378
Other fees
Disaggregation of Revenue [Line Items]
Total Revenue	960	1,091	1,876	2,294
Corporate and Other
Disaggregation of Revenue [Line Items]
Total Revenue	7,420	4,327	12,524	7,344
Corporate and Other | Instructional services, net of grants and scholarships
Disaggregation of Revenue [Line Items]
Total Revenue	7,420	4,327	12,524	7,344
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	73,557	69,904	147,535	142,994
APUS | Operating Segments | Instructional services, net of grants and scholarships
Disaggregation of Revenue [Line Items]
Total Revenue	72,923	69,336	146,345	141,921
APUS | Operating Segments | Graduation fees
Disaggregation of Revenue [Line Items]
Total Revenue	388	380	757	715
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	246	188	433	358
RU | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenue	51,971	63,891	109,438	130,990
RU | Operating Segments | Instructional services, net of grants and scholarships
Disaggregation of Revenue [Line Items]
Total Revenue	43,513	53,323	91,709	109,240
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	7,890	9,798	16,597	20,092
RU | Operating Segments | Other fees
Disaggregation of Revenue [Line Items]
Total Revenue	568	770	1,132	1,658
HCN | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenue	14,266	11,486	27,406	23,027
HCN | Operating Segments | Instructional services, net of grants and scholarships
Disaggregation of Revenue [Line Items]
Total Revenue	12,116	9,730	23,097	19,463
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	2,004	1,623	3,998	3,286
HCN | Operating Segments | Other fees
Disaggregation of Revenue [Line Items]
Total Revenue	$ 146	$ 133	$ 311	$ 278