Goodwill and Intangible Assets - Narrative (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2022 USD ($)	Mar. 31, 2022 reportingUnit	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of reporting units | reportingUnit		4
Goodwill impairment charge				$ 28,782
Net carrying amount	$ 386,886			386,886		$ 410,523
Amortization expense	28,500		$ 23,200	59,900	$ 44,800
edX
Finite-Lived Intangible Assets [Line Items]
Working capital adjustment				(5,000)
Acquired assets and assumed liabilities of edX				11,500
In Process Capitalized Technology and Content Development
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	$ 50,700			$ 50,700		$ 46,300