Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses, net of current portion	$ 19,277		$ 19,852
Equity method investments	14,011	$ 13,887	15,582	$ 17,401	$ 17,879	$ 15,795
Cloud computing arrangements	6,557		5,957
Other investments	3,826		3,576
Tuition receivable, non-current	1,894		2,466
Other	3,730		4,864
Other assets	$ 49,295		$ 52,297