Leases - Narrative (Details)	1 Months Ended	3 Months Ended			12 Months Ended
	May 31, 2024 campus	Sep. 30, 2025 USD ($)	Jun. 30, 2024 USD ($) campus	Mar. 31, 2024 USD ($)	Dec. 31, 2025 USD ($) state campus	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Property, Plant and Equipment [Line Items]
Extension term					1 year
Variable lease payment					$ 0
Lease expense					16,900,000	$ 18,900,000	$ 20,700,000
Cash paid for amounts included in operating lease liabilities					17,700,000	18,500,000	20,200,000
Loss on lease termination					77,000	3,715,000	0
Present value of operating lease liabilities					$ 238,000
Interest rate					7.00%
Finance lease expense					$ 200,000	$ 200,000	$ 100,000
RU Segment
Property, Plant and Equipment [Line Items]
Number of campuses | campus					18
Number of states | state					5
RU Segment | TEXAS
Property, Plant and Equipment [Line Items]
Lease termination fee				$ 2,200,000
Loss on lease termination				$ 2,100,000
RU Segment | MINNESOTA
Property, Plant and Equipment [Line Items]
Lease termination fee			$ 1,200,000
Loss on lease termination			$ 1,200,000
Number of consolidated campuses | campus			2
RU Segment | WISCONSIN
Property, Plant and Equipment [Line Items]
Number of campuses to be closed | campus	2
Lease impairment		$ 100,000	$ 400,000
HCN Segment
Property, Plant and Equipment [Line Items]
Number of campuses | campus					8
Number of states | state					3