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WARRANTY COSTS AND OTHER CONTINGENCIES- Repurchase Obligations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018
Repurchase obligations |  |  |
Repurchases of inventory | $ 3.4 |  | $ 0.0
Outstanding amounts recorded in accrued expenses | 2.7 | $ 2.7 |
Redistributed amounts | 3.1 |  |
Net realizable value of repurchased inventory | 0.3 | 0.3 |
Costs associated with repurchases | 0.1 |  |
Total purchase obligation | 20.3 | $ 20.3 |
Floor plan lender one |  |  |
Repurchase obligations |  |  |
Repurchase limit in percentage of amount of average net receivables |  | 16.00% |
Total purchase obligation | 13.1 | $ 13.1 |
Additional floor plan lenders |  |  |
Repurchase obligations |  |  |
Total purchase obligation | $ 7.2 | $ 7.2 |

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 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
Period Type: | duration

X
- Definition Amount of net realizable value of repurchased inventory under repurchase obligations. + References No definition available. + Details
Name: | mpx_RepurchaseObligationsNetRealizableValueOfRepurchasedInventory
Namespace Prefix: | mpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Outstanding amounts recorded in accrued expenses under repurchase obligations. + References No definition available. + Details
Name: | mpx_RepurchaseObligationsOutstandingAmountsRecordedInAccruedExpenses
Namespace Prefix: | mpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Redistributed amounts under repurchase obligations. + References No definition available. + Details
Name: | mpx_RepurchaseObligationsRedistributedAmount
Namespace Prefix: | mpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of repurchases of inventory under contractual agreements. + References No definition available. + Details
Name: | mpx_RepurchaseObligationsRepurchasesOfInventoryUnderContractualAgreements
Namespace Prefix: | mpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | us-gaap_ProductWarrantyLiabilityLineItems
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

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

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