Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Useful life - acquired (in years)			3 years
Amortization expenses	$ 3,522,000	$ 8,932,000	$ 10,954,000	$ 47,731,000
Trade names
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Impairment of intangible assets	$ 0	$ 0	0	0
Student relationships
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Amortization expenses			$ 8,500,000	$ 41,400,000