Concentration - Summary of Segment Revenue Derived from Students by Primary Funding Source (Details) - Revenue from Contract with Customer - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
APUS | DoD tuition assistance programs
Concentration Risk [Line Items]
Concentration risk percentage	45.00%	43.00%	39.00%
APUS | VA education benefits
Concentration Risk [Line Items]
Concentration risk percentage	21.00%	22.00%	23.00%
APUS | Title IV programs
Concentration Risk [Line Items]
Concentration risk percentage	20.00%	21.00%	25.00%
APUS | Cash and other sources
Concentration Risk [Line Items]
Concentration risk percentage	14.00%	14.00%	13.00%
RU Segment | VA education benefits
Concentration Risk [Line Items]
Concentration risk percentage	2.00%	2.00%	2.00%
RU Segment | Title IV programs
Concentration Risk [Line Items]
Concentration risk percentage	76.00%	77.00%	78.00%
RU Segment | Cash and other sources
Concentration Risk [Line Items]
Concentration risk percentage	22.00%	21.00%	20.00%
HCN Segment | VA education benefits
Concentration Risk [Line Items]
Concentration risk percentage	2.00%	2.00%	2.00%
HCN Segment | Title IV programs
Concentration Risk [Line Items]
Concentration risk percentage	81.00%	82.00%	80.00%
HCN Segment | Cash and other sources
Concentration Risk [Line Items]
Concentration risk percentage	17.00%	16.00%	18.00%