Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 273,564	$ 299,173	$ 532,419	$ 589,509
U.S. Higher Education Segment
Disaggregation of Revenue [Line Items]
Revenues	190,026	212,207	385,792	438,754
U.S. Higher Education Segment | Tuition, net of discounts, grants and scholarships
Disaggregation of Revenue [Line Items]
Revenues	181,374	203,433	368,729	420,910
U.S. Higher Education Segment | Other
Disaggregation of Revenue [Line Items]
Revenues	8,652	8,774	17,063	17,844
Australia/New Zealand Segment
Disaggregation of Revenue [Line Items]
Revenues	67,543	74,060	116,055	125,325
Australia/New Zealand Segment | Tuition, net of discounts, grants and scholarships
Disaggregation of Revenue [Line Items]
Revenues	65,847	72,340	113,383	122,562
Australia/New Zealand Segment | Other
Disaggregation of Revenue [Line Items]
Revenues	1,696	1,720	2,672	2,763
Education Technology Services Segment
Disaggregation of Revenue [Line Items]
Revenues	$ 15,995	$ 12,906	$ 30,572	$ 25,430