Leases - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) state	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) campus state	Sep. 30, 2022 USD ($)
Property, Plant and Equipment [Line Items]
Variable lease payments			$ 0
Lease expense	$ 5,300,000	$ 5,000,000	15,700,000	$ 15,100,000
Cash paid for amounts included in operating lease liabilities	5,000,000	4,800,000	15,200,000	14,700,000
Present value of operating lease liabilities	$ 137,000		$ 137,000
Interest rate	3.75%		3.75%
Finance lease expense	$ 27,000	$ 81,000	$ 27,000	$ 81,000
Minimum
Property, Plant and Equipment [Line Items]
Extension term (or more)			1 year
RU Segment
Property, Plant and Equipment [Line Items]
Number of campuses | campus			22
Number of states | state	6		6
HCN Segment | Ohio
Property, Plant and Equipment [Line Items]
Number of campuses | campus			8
Number of states | state	3		3