WARRANTY COSTS AND OTHER CONTINGENCIES (Details Textuals) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2014
WARRANTY COSTS AND OTHER CONTINGENCIES
Period of warranty provided by company to entire boat	1 year
Term of warranty for cockpit upholstery	2 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	$ 7.8
Maximum repurchase obligation - additional lenders	5.4
Aggregate repurchase obligation	$ 13.2

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

No definition available.

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

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

No definition available.

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

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

No definition available.

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

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

No definition available.

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

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

No definition available.

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

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

No definition available.

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

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

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

No definition available.