Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Changes in carrying amount
Balance, beginning of period	$ 1,251,888,000	$ 1,251,277,000
Additions	0	0
Impairments	0	0	$ 0
Currency translation adjustments	(45,005,000)	611,000
Balance, end of period	1,206,883,000	1,251,888,000	1,251,277,000
U.S. Higher Education
Changes in carrying amount
Balance, beginning of period	632,075,000	632,075,000
Additions	0	0
Impairments	0	0
Currency translation adjustments	0	0
Balance, end of period	632,075,000	632,075,000	632,075,000
Australia / New Zealand
Changes in carrying amount
Balance, beginning of period	519,813,000	519,202,000
Additions	0	0
Impairments	0	0
Currency translation adjustments	(45,005,000)	611,000
Balance, end of period	474,808,000	519,813,000	519,202,000
Education Technology Services
Changes in carrying amount
Balance, beginning of period	100,000,000	100,000,000
Additions	0	0
Impairments	0	0
Currency translation adjustments	0	0
Balance, end of period	$ 100,000,000	$ 100,000,000	$ 100,000,000