XML 8 R1.htm IDEA: XBRL DOCUMENT v3.20.2
Cover - $ / shares
 9 Months Ended
Sep. 30, 2020
Nov. 06, 2020
Cover [Abstract]    
Entity Central Index Key 0001026655  
Amendment Flag false  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --12-31  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2020  
Document Transition Report false  
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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company true  
Title of 12(b) Security Common Stock, par value $0.01  
Entity Listing, Par Value Per Share $ 0.01  
Security Exchange Name NYSEAMER  
Trading Symbol CMT  
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   8,496,655
Restricted Stock [Member]    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   524,782