XML 12 R1.htm IDEA: XBRL DOCUMENT v3.10.0.1
Document and Entity Information Document - shares
 6 Months Ended
Jun. 30, 2018
Aug. 08, 2018
Entity Information [Line Items]    
Entity Registrant Name CORE MOLDING TECHNOLOGIES INC.  
Entity Central Index Key 0001026655  
Document Type 10-Q  
Document Period End Date Jun. 30, 2018  
Amendment Flag false  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   7,990,443