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COMMITMENTS AND CONTINGENCIES (Detail Textuals) $ in Millions	12 Months Ended
	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