Segment and Geographic Information - Segment Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Total revenue	$ 241,464	$ 237,209	$ 494,793	$ 469,682
Total segment profitability	$ 21,902	$ 17,112	$ 34,182	$ 30,860
Total segment profitability margin	9.10%	7.20%	6.90%	6.60%
Degree Program Segment deferred revenue
Segment Reporting Information [Line Items]
Total revenue	$ 143,090	$ 146,214	$ 297,257	$ 292,089
Total segment profitability	$ 39,539	$ 27,973	$ 75,357	$ 53,861
Total segment profitability margin	27.60%	19.10%	25.40%	18.40%
Alternative Credential Segment accounts receivable
Segment Reporting Information [Line Items]
Total revenue	$ 98,374	$ 90,995	$ 197,536	$ 177,593
Total segment profitability	$ (17,637)	$ (10,861)	$ (41,175)	$ (23,001)
Total segment profitability margin	(17.90%)	(11.90%)	(20.80%)	(13.00%)