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Cover Page
Nov. 12, 2021
May 13, 2021
Cover [Abstract]    
Document Type   8-K
Document Period End Date Nov. 05, 2021  
Entity Registrant Name   Core Molding Technologies, Inc.
Entity Incorporation, State or Country Code   DE
Entity File Number   001-12505
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
Written Communications   false
Soliciting Material   false
Pre-commencement Tender Offer   false
Pre-commencement Issuer Tender Offer   false
Title of 12(b) Security   Common Stock, par value $0.01
Trading Symbol   CMT
Security Exchange Name   NYSEAMER
Entity Emerging Growth Company   false
Entity Central Index Key   0001026655
Amendment Flag   false