Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses, net of current portion	$ 15,634		$ 16,679
Equity method investments	13,595	$ 13,963	16,068	$ 16,175	$ 17,205	$ 13,879
Cloud computing arrangements, net of current portion	14,111		12,806
Tuition receivable, net, non-current	7,217		2,516
Other investments	2,786		2,806
Other	5,211		3,544
Other assets	$ 58,554		$ 54,419