Leases - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) state	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) campus state	Jun. 30, 2022 USD ($)
Property, Plant and Equipment [Line Items]
Variable lease payments			$ 0
Lease expense	$ 5,100,000	$ 5,100,000	10,400,000	$ 10,100,000
Cash paid for amounts included in operating lease liabilities	5,100,000	5,200,000	10,100,000	10,000,000
Present value of operating lease liabilities	$ 165,000		$ 165,000
Interest rate	3.75%		3.75%
Finance lease expense	$ 30,000	$ 100,000	$ 30,000	$ 100,000
Minimum
Property, Plant and Equipment [Line Items]
Extension term			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