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WARRANTY COSTS AND OTHER CONTINGENCIES (Details Textuals) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
WARRANTY COSTS AND OTHER CONTINGENCIES
Period of warranty provided by company to entire boat	1 year
Term of warranty for cockpit upholstery	3 years
Period of warranty provided by company to material and workmanship	10 years
Period of warranty provided by company to structural deck	5 years
Contractual repurchase limit (% of average net receivable) - one lender	16.00%
Maximum repurchase obligation - one lender	$ 8.1
Maximum repurchase obligation - additional lenders	4.6
Aggregate repurchase obligation	$ 12.7

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

Describe the approximate term of the warranty for cockpit upholstery provided by the company.

+ References

No definition available.

+ Details

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

X

- Definition

Describe the approximate term of the warranty for material and workmanship provided by the company.

+ References

No definition available.

+ Details

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

X

- Definition

Describe the approximate term of the warranty provided by the company.

+ References

No definition available.

+ Details

Name:	mpx_TermOfWarrantyOnProduct
Namespace Prefix:	mpx_
Data Type:	xbrli:durationItemType
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

- Details

Name:	us-gaap_ProductWarrantiesDisclosuresAbstract
Namespace Prefix:	us-gaap_
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