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Cover - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Mar. 09, 2023
Jun. 30, 2022
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-12505    
Entity Registrant Name CORE MOLDING TECHNOLOGIES, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 31-1481870    
Entity Address, Address Line One 800 Manor Park Drive    
Entity Address, City or Town Columbus    
Entity Address, State or Province OH    
Entity Address, Postal Zip Code 43228-0183    
City Area Code 614    
Local Phone Number 870-5000    
Title of 12(b) Security Common Stock, par value $0.01    
Trading Symbol CMT    
Security Exchange Name NYSEAMER    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 60,832
Entity Common Stock, Shares Outstanding (in shares)   9,113,163  
Documents Incorporated by Reference Portions of the registrant's 2022 definitive Proxy Statement to be filed with the Securities and Exchange Commission no later than 120 days after the end of the registrant's fiscal year are incorporated herein by reference in Part III of this Form 10-K.    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Entity Central Index Key 0001026655    
Amendment Flag false