Goodwill and Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Jan. 01, 2022	Dec. 31, 2021	Sep. 01, 2021	Aug. 10, 2021
Purchase Price Allocation
Goodwill	$ 59,593,000		$ 59,593,000		$ 112,593,000		$ 243,486,000
Amortization	4,000,000	$ 4,000,000	7,900,000	$ 7,900,000
Impairment charge			53,000,000		131,400,000
Impairment			26,500,000		15,500,000
Indefinite-lived intangible assets	28,221,000		28,221,000		39,221,000
Impairment of goodwill and intangible assets	64,000,000	144,900,000	64,000,000	$ 144,900,000
Accreditation and licenses
Purchase Price Allocation
Impairment			18,500,000		15,500,000
Indefinite-lived intangible assets	7,686,000		7,686,000		$ 10,686,000
RU Segment
Purchase Price Allocation
Goodwill	86,000,000		86,000,000					$ 217,400,000
Indefinite-lived intangible assets acquired	35,500,000		35,500,000					$ 51,000,000
Identified intangible assets with finite useful life	35,500,000		35,500,000
Impairment charge	53,000,000	131,400,000
Goodwill, impairment loss, tax effect	15,800,000	36,000,000
Impairment of goodwill and intangible assets	64,000,000	144,900,000
RU Segment | Trade name
Purchase Price Allocation
Indefinite-lived intangible assets	18,500,000		18,500,000
RU Segment | Accreditation and licenses
Purchase Price Allocation
Impairment	11,000,000	$ 13,500,000
Indefinite-lived intangible assets	6,000,000		6,000,000
HCN Segment
Purchase Price Allocation
Goodwill	26,600,000		26,600,000				38,600,000
Indefinite-lived intangible assets acquired							$ 3,700,000
Identified intangible assets with finite useful life	4,400,000		4,400,000
GSUSA Segment
Purchase Price Allocation
Goodwill						$ 0			$ 0
Indefinite-lived intangible assets acquired	0		0
Identified intangible assets with finite useful life	1,000,000		1,000,000
APUS Segment
Purchase Price Allocation
Indefinite-lived intangible assets acquired	0		0
Identified intangible assets with finite useful life	$ 0		$ 0