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Goodwill and Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Sep. 01, 2021	Aug. 10, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill	$ 243,993,000		$ 243,486,000
Amortization	4,000,000
Goodwill and intangible asset impairment	0	$ 0
Rasmussen
Business Acquisition [Line Items]
Goodwill	217,400,000			$ 217,430,000
Identified intangible assets with finite useful life	35,500,000
HCN Segment
Business Acquisition [Line Items]
Goodwill	26,600,000					$ 38,600,000
Indefinite-lived intangible assets acquired	51,000,000	$ 3,700,000
Identified intangible assets with finite useful life	4,400,000
Graduate School USA
Business Acquisition [Line Items]
Goodwill					$ 0
Identified intangible assets with finite useful life	$ 1,000,000