Long-Term Debt - Narrative (Details) $ in Thousands		1 Months Ended
	Jul. 26, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)	Jul. 11, 2024 USD ($)
Term Loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 850,000
Line of Credit | Concentra Credit Facilities
Line of Credit Facility [Line Items]
Debt instrument, covenant, leverage ratio	6.5
Debt instrument, leverage ratio			3.4
Line of Credit | Term Loan | Concentra Term Loan
Line of Credit Facility [Line Items]
Increase in revolving credit facility		$ 102,100
Principal outstanding		950,000
Line of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term debt outstanding			$ 0	$ 0
Line of Credit | Revolving Credit Facility | Concentra Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 400,000	450,000
Increase in revolving credit facility		$ 50,000
Available borrowing capacity			434,200
Line of Credit | Standby letters of credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 75,000
Line of Credit | Letter of Credit | Concentra Revolving Credit Facility
Line of Credit Facility [Line Items]
Outstanding letters of credit			$ 15,800
Senior notes | 6.875% senior notes
Line of Credit Facility [Line Items]
Principal outstanding					$ 650,000
Interest rate of debt (as a percent)			6.875%	6.875%
Long-term debt outstanding			$ 650,000	$ 650,000
Unamortized original issue discounts and debt issuance costs			$ 10,000