Acquisition Activity - Narrative (Details) - USD ($)				3 Months Ended			6 Months Ended
	Jan. 01, 2022	Sep. 01, 2021	Aug. 10, 2021	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Business Acquisition [Line Items]
Goodwill				$ 112,593,000			$ 112,593,000		$ 243,486,000
Impairment of goodwill and intangible assets							131,400,000
Acquisition-related expenses				400,000		$ 3,100,000	1,300,000	$ 3,600,000
Rasmussen
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired		$ 325,500,000
Goodwill		217,430,000		217,400,000			$ 217,400,000
Goodwill, period increase (decrease)					$ 500,000
Aggregate purchase price		$ 329,000,000
Graduate School USA
Business Acquisition [Line Items]
Goodwill			$ 0
Aggregate purchase price	$ 1,000,000		1,000,000
Net working capital			1,900,000
Initial cash payment			500,000
Consideration retained by acquirer			$ 500,000
Non-taxable gain on acquisition				3,800,000
Reduction of gain on acquisition				700,000
RU Segment
Business Acquisition [Line Items]
Impairment of goodwill and intangible assets				$ 131,400,000