Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 258,855	$ 290,336
U.S. Higher Education Segment
Disaggregation of Revenue [Line Items]
Revenues	195,766	226,547
U.S. Higher Education Segment | Tuition, net of discounts, grants and scholarships
Disaggregation of Revenue [Line Items]
Revenues	187,355	217,477
U.S. Higher Education Segment | Other
Disaggregation of Revenue [Line Items]
Revenues	8,411	9,070
Australia/New Zealand Segment
Disaggregation of Revenue [Line Items]
Revenues	48,512	51,265
Australia/New Zealand Segment | Tuition, net of discounts, grants and scholarships
Disaggregation of Revenue [Line Items]
Revenues	47,536	50,222
Australia/New Zealand Segment | Other
Disaggregation of Revenue [Line Items]
Revenues	976	1,043
Education Technology Services
Disaggregation of Revenue [Line Items]
Revenues	$ 14,577	$ 12,524