Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses, net of current portion	$ 18,753		$ 19,852
Equity method investments	13,979	$ 14,011	15,582	$ 14,532	$ 17,401	$ 15,795
Cloud computing arrangements	6,835		5,957
Other investments	3,896		3,576
Tuition receivable, net, non-current	2,716		2,466
Other	4,168		4,864
Other assets	$ 50,347		$ 52,297