Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses, net of current portion	$ 20,011	$ 19,852
Equity method investments	13,887	15,582	$ 17,879	$ 15,795
Cloud computing arrangements	6,547	5,957
Other investments	3,677	3,576
Tuition receivable, non-current	2,062	2,466
Other	3,882	4,864
Other assets	$ 50,066	$ 52,297