Segment Information - Summary of Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue:
Total Revenue	$ 154,747	$ 88,541
Depreciation and amortization:
Total Depreciation and amortization	8,148	2,651
Income (loss) from operations before interest and income taxes:
Total income from operations before interest and income taxes	5,200	10,637
Interest (expense) income:
Total Interest (expense) income	(3,355)	114
Income tax expense (benefit):
Total Income tax expense	1,040	2,639
Capital expenditures:
Corporate and Other	2,965	1,528
Corporate and Other
Revenue:
Total Revenue	3,017	(67)
Depreciation and amortization:
Total Depreciation and amortization	146	10
Income (loss) from operations before interest and income taxes:
Total income from operations before interest and income taxes	(7,878)	(4,177)
Interest (expense) income:
Total Interest (expense) income	(3,399)	21
Income tax expense (benefit):
Total Income tax expense	(3,624)	(1,333)
Capital expenditures:
Corporate and Other	100	0
APUS Segment | Operating Segments
Revenue:
Total Revenue	73,090	77,476
Depreciation and amortization:
Total Depreciation and amortization	1,701	2,493
Income (loss) from operations before interest and income taxes:
Total income from operations before interest and income taxes	13,182	14,031
Interest (expense) income:
Total Interest (expense) income	39	91
Income tax expense (benefit):
Total Income tax expense	4,674	3,767
Capital expenditures:
Corporate and Other	441	971
RU Segment | Operating Segments
Revenue:
Total Revenue	67,099	0
Depreciation and amortization:
Total Depreciation and amortization	6,079	0
Income (loss) from operations before interest and income taxes:
Total income from operations before interest and income taxes	891	0
Interest (expense) income:
Total Interest (expense) income	3	0
Income tax expense (benefit):
Total Income tax expense	306	0
Capital expenditures:
Corporate and Other	1,924	0
HCN Segment | Operating Segments
Revenue:
Total Revenue	11,541	11,132
Depreciation and amortization:
Total Depreciation and amortization	222	148
Income (loss) from operations before interest and income taxes:
Total income from operations before interest and income taxes	(995)	783
Interest (expense) income:
Total Interest (expense) income	2	2
Income tax expense (benefit):
Total Income tax expense	(316)	205
Capital expenditures:
Corporate and Other	$ 500	$ 557