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WARRANTY COSTS AND OTHER CONTINGENCIES (Detail Textuals) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Warrant Cost And Other Contingencies [Line Items]
Repurchased inventory	$ 450
Contractual repurchase limit (% of average net receivable) - one lender	16.00%
Maximum repurchase obligation - one lender	$ 8,800
Maximum repurchase obligation - additional lenders	7,900
Aggregate repurchase obligation	$ 16,700
Chaparral products
Warrant Cost And Other Contingencies [Line Items]
Period of warranty provided by company to structural hull	5 years
Period of warranty provided by company on non-transferable structural deck	5 years
Period of warranty provided by company on additional items	one to five years.
Robalo products
Warrant Cost And Other Contingencies [Line Items]
Period of warranty provided by company on transferable structural hull	10 years
Period of warranty provided by company to structural hull	5 years
Period of warranty provided by company on transferable other components	1 year

X

- Definition

This element represents the percentage of the average net receivables which is used to calculate the contractual repurchase limit.

+ References

No definition available.

+ Details

Name:	mpx_ContractualObligationOfRepurchaseLimitInPercentageOfAmountOfAverageNetReceivables
Namespace Prefix:	mpx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents amount of inventory repurchased.

+ References

No definition available.

+ Details

Name:	mpx_InventoryRepurchased
Namespace Prefix:	mpx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Describe the approximate term of the warranty for structural deck provided by the company.

+ References

No definition available.

+ Details

Name:	mpx_TermOfNonTransferableWarrantyForStructuralDeck
Namespace Prefix:	mpx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents term of transferable warranty for structural hull.

+ References

No definition available.

+ Details

Name:	mpx_TermOfTransferableWarrantyForStructuralHull
Namespace Prefix:	mpx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Describe the approximate term of the warranty on transferable other components provided by the company.

+ References

No definition available.

+ Details

Name:	mpx_TermOfTransferableWarrantyOnOtherComponents
Namespace Prefix:	mpx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Describe the approximate term of the warranty for structural hull provided by the company.

+ References

No definition available.

+ Details

Name:	mpx_TermOfWarrantyForStructuralHull
Namespace Prefix:	mpx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents term of warranty on additional items.

+ References

No definition available.

+ Details

Name:	mpx_TermOfWarrantyOnAdditionalItems
Namespace Prefix:	mpx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents threshold limit for contractual repurchases under agreements during prior12 month period.

+ References

No definition available.

+ Details

Name:	mpx_ThresholdLimitForContractualRepurchasesUnderAgreementsDuringPrior12MonthPeriod
Namespace Prefix:	mpx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the threshold limit for aggregate contractual repurchases under agreements having term of less than one year.

+ References

No definition available.

+ Details

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

X

- Definition

Represents warrant cost and other contingencies.

+ References

No definition available.

+ Details

Name:	mpx_WarrantCostAndOtherContingenciesLineItems
Namespace Prefix:	mpx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

Name:	us-gaap_PurchaseObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_ProductOrServiceAxis=mpx_ChaparralProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=mpx_RobaloProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: