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EMPLOYEE BENEFIT PLANS - Amounts recorded in consolidated balance sheet as pension liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
EMPLOYEE BENEFIT PLANS
SERP liability	$ (14,440)	$ (15,564)

X

- Definition

This element represents the amount of defined benefit plan contributions and deferrals of supplemental retirement plan.

+ References

No definition available.

+ Details

Name:	mpx_DefinedBenefitPlanSupplementalExecutiveRetirementPlanContributionsAndDeferrals
Namespace Prefix:	mpx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration