WARRANTY COSTS AND OTHER CONTINGENCIES (Details Textuals) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2013
Product Warranty Liability [Line Items]
Period of warranty provided by company to entire boat	1 year
Contractual repurchase limit (% of average net receivable) - one lender	15.00%
Maximum repurchase obligation - additional lenders	$ 5.0
Aggregate repurchase obligation	$ 11.2
Minimum
Product Warranty Liability [Line Items]
Period of warranty provided by company to entire deck	5 years
Maximum
Product Warranty Liability [Line Items]
Period of warranty provided by company to entire deck	10 years

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

Name:	mpx_ProductWarrantyLiabilityLineItems
Namespace Prefix:	mpx_
Data Type:	xbrli:stringItemType
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

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

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.