WARRANTY COSTS AND OTHER CONTINGENCIES (Details Textuals) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2012	Dec. 31, 2011
Product Warranty Liability [Line Items]
Period of warranty provided by company to entire boat	1 year
Inventory repurchased to redistributed among existing and replacement dealers		$ 0.8
Contractual repurchase limit	15.00%
Maximum repurchase obligation	6.0
Aggregate repurchase obligation	$ 10.8
Maximum
Product Warranty Liability [Line Items]
Period of warranty provided by company to entire deck	10 years

The total amount of inventory repurchased by the company which were redistributed among existing and replacement dealers.

No definition available.

Name:	mpx_InventoryRepurchasedDistributedAmongExistingAndReplacementDealers
Namespace Prefix:	mpx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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 aggregate threshold limit for aggregate contractual repurchases under agreements.

No definition available.

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

Represents the threshold limit for aggregate contractual repurchases as percentage of account receivables.

No definition available.

Name:	mpx_ThresholdLimitForContractualRepurchasesAsPercentageOfAccountReceivables
Namespace Prefix:	mpx_
Data Type:	num:percentItemType
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