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COMMITMENTS AND CONTINGENCIES (Detail Textuals) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
COMMITMENTS AND CONTINGENCIES |
Repurchase limit in percentage of amount of average net receivables | 16.00%
Maximum repurchase obligation for one lender | $ 15.0
Maximum repurchase obligation all additional lenders | 5.7
Aggregate repurchase obligation | $ 20.7

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 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