Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2023	Oct. 27, 2023
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-38894
Entity Registrant Name	Mayville Engineering Company, Inc.
Entity Incorporation, State or Country Code	WI
Entity Tax Identification Number	39-0944729
Entity Address, Address Line One	715 South Street
Entity Address, City or Town	Mayville
Entity Address, State or Province	WI
Entity Address, Postal Zip Code	53050
City Area Code	920
Local Phone Number	387-4500
Title of 12(b) Security	Common Stock, no par value
Trading Symbol	MEC
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		20,308,356
Entity Central Index Key	0001766368
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false