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COMMITMENTS AND CONTINGENCIES (Detail Textuals) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014
COMMITMENTS AND CONTINGENCIES |  |  |
Contractually obligated to repurchase inventory | $ 1,100 |  |
Reduction of net sales |  |  | $ 75
Repurchase limit in percentage of amount of average net receivables |  | 16.00% |
Maximum repurchase obligation for one lender |  | $ 8,500 |
Maximum repurchase obligation all additional lenders |  | 6,700 |
Aggregate repurchase obligation |  | $ 15,200 |

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 Represents the amount of contractually obligated to repurchase inventory. + References No definition available. + Details
Name: | mpx_ContractuallyObligatedToRepurchaseInventory
Namespace Prefix: | mpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents reduction of net sales due to contractual repurchases. + References No definition available. + Details
Name: | mpx_ReductionOfNetSalesDueToContractualRepurchase
Namespace Prefix: | mpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of threshold limit for aggregate contractual repurchases under agreements. + References No definition available. + Details
Name: | mpx_ThresholdLimitForContractualRepurchasesUnderAgreementsAmount
Namespace Prefix: | mpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
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