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

This element represents the percentage of the average net receivables which is used to calculate the contractual repurchase limit.

No definition available.

Name:	mpx_ContractualObligationOfRepurchaseLimitInPercentageOfAmountOfAverageNetReceivables
Namespace Prefix:	mpx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the amount of contractually obligated to repurchase inventory.

No definition available.

Name:	mpx_ContractuallyObligatedToRepurchaseInventory
Namespace Prefix:	mpx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents reduction of net sales due to contractual repurchases.

No definition available.

Name:	mpx_ReductionOfNetSalesDueToContractualRepurchase
Namespace Prefix:	mpx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the amount of threshold limit for aggregate contractual repurchases under agreements.

No definition available.

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

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

No definition available.

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

No definition available.