Leases - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) state campus	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Extension term	1 year
Variable lease payment | $	$ 0
Lease expense | $	7,500,000	$ 2,900,000	$ 2,600,000
Operating lease, payments | $	$ 7,200,000	$ 2,900,000
RU Segment
Property, Plant and Equipment [Line Items]
Number of campuses | campus	23
Number of states | state	6
HCN Segment | Ohio
Property, Plant and Equipment [Line Items]
Number of campuses | campus	6
HCN Segment | Indiana
Property, Plant and Equipment [Line Items]
Number of campuses | campus	1