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Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 19, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	MARINE PRODUCTS CORP
Entity Central Index Key	0001129155
Trading Symbol	mpx
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		34,498,852
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Entity Small Business	false
Entity Emerging Growth Company	false

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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