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WARRANTY COSTS AND OTHER CONTINGENCIES (Detail Textuals) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Warrant Cost And Other Contingencies [Line Items]  
Contractual repurchase limit (% of average net receivable) - one lender 16.00%mpx_ContractualObligationOfRepurchaseLimitInPercentageOfAmountOfAverageNetReceivables
Maximum repurchase obligation - one lender $ 8.2mpx_ThresholdLimitForContractualRepurchasesUnderAgreementsDuringPrior12MonthPeriod
Maximum repurchase obligation - additional lenders 6.5mpx_ThresholdLimitForContractualRepurchasesUnderAgreementsHavingTermOfLessThanOneYear
Aggregate repurchase obligation $ 14.7us-gaap_PurchaseObligation
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