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COMMITMENTS AND CONTINGENCIES - Dealer Floor Plan Financing (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
COMMITMENTS AND CONTINGENCIES |  |
Repurchases of inventory | $ 3.4 | $ 0.0
Liability related to repurchase remains outstanding | 0.0 |
Redistributed amounts | 3.1 |
Net realizable value of repurchased inventory | 0.3 |
Costs associated with repurchases | 0.1 |
Total purchase obligation | $ 20.8 |
Floor plan lender one |  |
COMMITMENTS AND CONTINGENCIES |  |
Repurchase limit in percentage of amount of average net receivables | 16.00% |
Total purchase obligation | $ 13.1 |
Additional floor plan lenders |  |
COMMITMENTS AND CONTINGENCIES |  |
Total purchase obligation | $ 7.7 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | mpx_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- 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_
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- Definition The amount of liability related to repurchase outstanding. + References No definition available. + Details
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Namespace Prefix: | mpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Costs associated with repurchases under repurchase obligations. + References No definition available. + Details
Name: | mpx_RepurchaseObligationsCostsAssociatedWithRepurchases
Namespace Prefix: | mpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Amount of net realizable value of repurchased inventory under repurchase obligations. + References No definition available. + Details
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Namespace Prefix: | mpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Redistributed amounts under repurchase obligations. + References No definition available. + Details
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Namespace Prefix: | mpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Amount of repurchases of inventory under contractual agreements. + References No definition available. + Details
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Namespace Prefix: | mpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_CounterpartyNameAxis=mpx_FloorPlanLenderOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=mpx_AdditionalFloorPlanLendersMember
Namespace Prefix: |
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Balance Type: |
Period Type: |