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Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Feb. 01, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-34465    
Entity Registrant Name SELECT MEDICAL HOLDINGS CORP    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-1764048    
Entity Address, Address Line One 4714 Gettysburg Road    
Entity Address, Address Line Two P.O. Box 2034    
Entity Address, City or Town Mechanicsburg    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 17055    
City Area Code 717    
Local Phone Number 972-1100    
Title of 12(b) Security Common Stock, $0.001 par value per share    
Trading Symbol SEM    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 1,558,171,836
Entity Common Stock, Shares Outstanding   124,017,191  
Documents Incorporated by Reference
Listed hereunder are the documents, any portions of which are incorporated by reference and the Parts of this Form 10-K into which such portions are incorporated:
1.    The registrant’s definitive proxy statement for use in connection with the 2026 Annual Meeting of Stockholders to be held on or about April 23, 2026 to be filed within 120 days after the registrant’s fiscal year ended December 31, 2025, portions of which are incorporated by reference into Part III of this Form 10-K. Such definitive proxy statement, except for the parts therein which have been specifically incorporated by reference, should not be deemed “filed” for the purposes of this form 10-K.
    
Entity Central Index Key 0001320414    
Amendment Flag false    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY