Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Consolidated revenue	$ 287,680	$ 273,564	$ 544,286	$ 532,419
U.S. Higher Education Segment
Disaggregation of Revenue [Line Items]
Consolidated revenue	202,679	190,026	399,574	385,792
U.S. Higher Education Segment | Tuition, net of discounts, grants and scholarships
Disaggregation of Revenue [Line Items]
Consolidated revenue	195,144	181,374	383,924	368,729
U.S. Higher Education Segment | Other
Disaggregation of Revenue [Line Items]
Consolidated revenue	7,535	8,652	15,650	17,063
Australia/New Zealand Segment
Disaggregation of Revenue [Line Items]
Consolidated revenue	65,472	67,543	106,975	116,055
Australia/New Zealand Segment | Tuition, net of discounts, grants and scholarships
Disaggregation of Revenue [Line Items]
Consolidated revenue	63,766	65,847	104,188	113,383
Australia/New Zealand Segment | Other
Disaggregation of Revenue [Line Items]
Consolidated revenue	1,706	1,696	2,787	2,672
Education Technology Services Segment
Disaggregation of Revenue [Line Items]
Consolidated revenue	$ 19,529	$ 15,995	$ 37,737	$ 30,572