Segment Information - Summary of Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue
Revenue	$ 154,000	$ 98,248	$ 78,014	$ 88,541	$ 85,909	$ 79,133	$ 82,127	$ 74,616	$ 418,803	$ 321,785	$ 286,270
Depreciation and Amortization
Total Depreciation and Amortization									17,832	12,984	15,596
Income (loss) from operations before interest and income taxes
Total income from operations before interest and income taxes									30,371	24,757	12,756
Interest income (expense)
Interest income (expense)									(4,277)	1,092	3,908
Income Tax Expense (Benefit)
Total Income Tax Expense									7,511	7,020	5,187
Capital Expenditures
Total Capital Expenditures									11,828	4,926	7,255
Operating Segments | APUS Segment
Revenue
Revenue									283,700	285,938	257,050
Depreciation and Amortization
Total Depreciation and Amortization									9,064	12,323	14,617
Income (loss) from operations before interest and income taxes
Total income from operations before interest and income taxes									51,050	43,438	37,225
Interest income (expense)
Interest income (expense)									210	303	473
Income Tax Expense (Benefit)
Total Income Tax Expense									14,023	11,127	10,312
Capital Expenditures
Total Capital Expenditures									3,902	4,724	6,472
Operating Segments | RU Segment
Revenue
Revenue									89,483	0	0
Depreciation and Amortization
Total Depreciation and Amortization									7,989	0	0
Income (loss) from operations before interest and income taxes
Total income from operations before interest and income taxes									1,630	0	0
Interest income (expense)
Interest income (expense)									132	0	0
Income Tax Expense (Benefit)
Total Income Tax Expense									509	0	0
Capital Expenditures
Total Capital Expenditures									5,987	0	0
Operating Segments | HCN Segment
Revenue
Revenue									45,803	36,091	29,479
Depreciation and Amortization
Total Depreciation and Amortization									738	620	937
Income (loss) from operations before interest and income taxes
Total income from operations before interest and income taxes									1,829	722	(10,768)
Interest income (expense)
Interest income (expense)									9	17	42
Income Tax Expense (Benefit)
Total Income Tax Expense									522	193	(2,567)
Capital Expenditures
Total Capital Expenditures									1,939	202	776
Corporate and Other
Revenue
Revenue									(183)	(244)	(259)
Depreciation and Amortization
Total Depreciation and Amortization									41	41	42
Income (loss) from operations before interest and income taxes
Total income from operations before interest and income taxes									(24,138)	(19,403)	(13,701)
Interest income (expense)
Interest income (expense)									(4,628)	772	3,393
Income Tax Expense (Benefit)
Total Income Tax Expense									(7,543)	(4,300)	(2,558)
Capital Expenditures
Total Capital Expenditures									$ 0	$ 0	$ 7