Basis of Presentation	3 Months Ended
Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and include all of the information and disclosures required by accounting principles generally accepted in the United States of America for interim reporting, which are less than those required for annual reporting. In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments (all of which are normal and recurring in nature) necessary to present fairly the financial position of Core Molding Technologies, Inc. and its subsidiaries (“Core Molding Technologies” or the “Company”) at March 31, 2018, and the results of operations and cash flows for the three months ended March 31, 2018. The Company has reclassified certain prior-year amounts to confirm to the current-year's presentation. The “Notes to Consolidated Financial Statements” contained in the Company's 2017 Annual Report to Shareholders, should be read in conjunction with these consolidated financial statements. Core Molding Technologies is a manufacturer of sheet molding compound ("SMC") and molder of thermoset and thermoplastic products. The Company produces high quality molded products, assemblies and SMC materials for varied markets, including medium and heavy-duty trucks, automotive, marine, home improvement, water management, agriculture, construction and other commercial markets. The Company offers customers a wide range of manufacturing processes to fit various program volume and investment requirements. These processes include compression molding of SMC, bulk molding compounds (BMC), resin transfer molding (RTM), liquid molding of dicyclopentadiene (DCPD), spray-up and hand-lay-up, glass mat thermoplastics (GMT), direct long-fiber thermoplastics (D-LFT) and structural foam and web injection molding. Core Molding Technologies has its headquarters in Columbus, Ohio, and operates production facilities in Columbus and Batavia, Ohio; Gaffney, South Carolina; Winona, Minnesota; Matamoros and Escobedo, Mexico; and Cobourg, Ontario, Canada.

The accompanying unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and include all of the information and disclosures required by accounting principles generally accepted in the United States of America for interim reporting, which are less than those required for annual reporting. In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments (all of which are normal and recurring in nature) necessary to present fairly the financial position of Core Molding Technologies, Inc. and its subsidiaries (“Core Molding Technologies” or the “Company”) at March 31, 2018, and the results of operations and cash flows for the three months ended March 31, 2018. The Company has reclassified certain prior-year amounts to confirm to the current-year's presentation. The “Notes to Consolidated Financial Statements” contained in the Company's 2017 Annual Report to Shareholders, should be read in conjunction with these consolidated financial statements.

Core Molding Technologies is a manufacturer of sheet molding compound ("SMC") and molder of thermoset and thermoplastic products. The Company produces high quality molded products, assemblies and SMC materials for varied markets, including medium and heavy-duty trucks, automotive, marine, home improvement, water management, agriculture, construction and other commercial markets. The Company offers customers a wide range of manufacturing processes to fit various program volume and investment requirements. These processes include compression molding of SMC, bulk molding compounds (BMC), resin transfer molding (RTM), liquid molding of dicyclopentadiene (DCPD), spray-up and hand-lay-up, glass mat thermoplastics (GMT), direct long-fiber thermoplastics (D-LFT) and structural foam and web injection molding. Core Molding Technologies has its headquarters in Columbus, Ohio, and operates production facilities in Columbus and Batavia, Ohio; Gaffney, South Carolina; Winona, Minnesota; Matamoros and Escobedo, Mexico; and Cobourg, Ontario, Canada.