Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total Revenue	$ 152,438	$ 149,535	$ 149,608	$ 154,747	$ 154,000	$ 98,248	$ 78,014	$ 88,541	$ 606,328	$ 418,803	$ 321,785
Instructional services, net of grants and scholarships
Disaggregation of Revenue [Line Items]
Total Revenue									554,702	394,590	313,930
Graduation fees
Disaggregation of Revenue [Line Items]
Total Revenue									1,348	1,309	1,336
Textbook and other course materials
Disaggregation of Revenue [Line Items]
Total Revenue									45,704	20,156	5,197
Other fees
Disaggregation of Revenue [Line Items]
Total Revenue									4,574	2,748	1,322
Corporate and Other
Disaggregation of Revenue [Line Items]
Total Revenue									20,865	(183)	(244)
Corporate and Other | Instructional services, net of grants and scholarships
Disaggregation of Revenue [Line Items]
Total Revenue									20,865	(183)	(243)
Corporate and Other | Graduation fees
Disaggregation of Revenue [Line Items]
Total Revenue									0	0	0
Corporate and Other | Textbook and other course materials
Disaggregation of Revenue [Line Items]
Total Revenue									0	0	0
Corporate and Other | Other fees
Disaggregation of Revenue [Line Items]
Total Revenue									0	0	(1)
APUS | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenue									285,128	283,700	285,938
APUS | Operating Segments | Instructional services, net of grants and scholarships
Disaggregation of Revenue [Line Items]
Total Revenue									283,079	281,689	283,827
APUS | Operating Segments | Graduation fees
Disaggregation of Revenue [Line Items]
Total Revenue									1,348	1,309	1,336
APUS | Operating Segments | Textbook and other course materials
Disaggregation of Revenue [Line Items]
Total Revenue									0	0	0
APUS | Operating Segments | Other fees
Disaggregation of Revenue [Line Items]
Total Revenue									701	702	775
RU | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenue									253,257	89,483	0
RU | Operating Segments | Instructional services, net of grants and scholarships
Disaggregation of Revenue [Line Items]
Total Revenue									211,253	74,515	0
RU | Operating Segments | Graduation fees
Disaggregation of Revenue [Line Items]
Total Revenue									0	0	0
RU | Operating Segments | Textbook and other course materials
Disaggregation of Revenue [Line Items]
Total Revenue									38,740	13,461	0
RU | Operating Segments | Other fees
Disaggregation of Revenue [Line Items]
Total Revenue									3,264	1,507	0
HCN | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenue									47,078	45,803	36,091
HCN | Operating Segments | Instructional services, net of grants and scholarships
Disaggregation of Revenue [Line Items]
Total Revenue									39,505	38,569	30,346
HCN | Operating Segments | Graduation fees
Disaggregation of Revenue [Line Items]
Total Revenue									0	0	0
HCN | Operating Segments | Textbook and other course materials
Disaggregation of Revenue [Line Items]
Total Revenue									6,964	6,695	5,197
HCN | Operating Segments | Other fees
Disaggregation of Revenue [Line Items]
Total Revenue									$ 609	$ 539	$ 548