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Cover
Dec. 03, 2020
Cover [Abstract]  
Entity Central Index Key 0001026655
Amendment Flag false
Document Type 8-K
Document Period End Date Dec. 03, 2020
Entity Registrant Name Core Molding Technologies, Inc.
Entity File Number 001-12505
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
Entity Emerging Growth Company false
Entity Listings [Line Items]  
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Common Stock [Member]  
Entity Listings [Line Items]  
Title of 12(b) Security Common Stock, par value $0.01
Trading Symbol CMT
Security Exchange Name NYSEAMER
Preferred Stock [Member]  
Entity Listings [Line Items]  
Title of 12(b) Security Preferred Stock purchase rights, par value $0.01
Trading Symbol N/A
Security Exchange Name NYSEAMER