Organization (Details) $ / shares in Units, $ in Millions				6 Months Ended
	Jul. 26, 2024 USD ($) $ / shares shares	Jun. 25, 2024	Mar. 04, 2024	Jun. 30, 2024 clinic state health_center $ / shares
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of occupational health centers operated by entity | health_center				547
Number of onsite clinics | clinic				154
Number of states in which entity operates | state				42
Member interests converted to common shares			1
Stock split conversion ratio		0.233
Common stock, par value (in dollars per share)				$ 0.01
Select Medical Corporation | Concentra Group Holdings Parent
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Outstanding member interest				100.00%
Subsequent Event | IPO
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of shares issued in initial public offering (in shares) | shares	22,500,000
Common stock, par value (in dollars per share)	$ 0.01
Sale of stock, price per share (in dollars per share)	$ 23.50
Proceeds from initial public offering | $	$ 499.7
Underwriting discounts and commissions | $	$ 29.1
Subsequent Event | IPO | Select Medical Corporation | Concentra Group Holdings Parent
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Outstanding member interest	81.74%