Organization and Significant Accounting Policies - Business Description (Details) $ / shares in Units, $ in Millions						12 Months Ended
	Jun. 01, 2025 clinic	Nov. 25, 2024 shares	Jul. 26, 2024 USD ($) $ / shares shares	Jun. 25, 2024	Mar. 04, 2024	Dec. 31, 2025 state clinic health_center $ / shares	Dec. 31, 2024 $ / shares	Nov. 24, 2024
Segment information
Number of occupational health centers operated by entity | health_center						628
Number of onsite health clinics | clinic	400					411
Member interests converted to common shares					1
Stock split conversion ratio				0.233
Common stock, par value (in dollars per share) | $ / shares						$ 0.01	$ 0.01
Occupational Health Centers
Segment information
Number of states in which the entity had operations | state						41
Onsite health clinics
Segment information
Number of states in which the entity had operations | state						44
Concentra Group Holdings Parent | Select Medical Corporation
Segment information
Special stock distribution (in shares) | shares		104,093,503
Outstanding membership interest owned by Select								81.70%
IPO
Segment information
Number of shares issued in initial public offering (in shares) | shares			22,500,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.01
Sale of stock, price per share (in dollars per share) | $ / shares			$ 23.50
Consideration received on transaction			$ 499.7
Payments of stock issuance costs			29.1
Net proceeds of IPO and debt financing transactions, excluding amounts repaid for debt			34.7
IPO | Select Medical Revolving Promissory Note
Segment information
Repayments of debt			$ 420.0
Over-Allotment Option
Segment information
Number of shares issued in initial public offering (in shares) | shares			750,000
Consideration received on transaction			$ 16.7
Payments of stock issuance costs			$ 1.0