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COMMITMENTS AND CONTINGENCIES - Dealer Floor Plan Financing (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
COMMITMENTS AND CONTINGENCIES
Repurchases of inventory		$ 3.4
Redistributed amounts		3.1
Net realizable value of repurchased inventory		0.3
Costs associated with repurchases		$ 0.1
Total purchase obligation	$ 13.2
Floor plan lender one
COMMITMENTS AND CONTINGENCIES
Liability related to repurchase remains outstanding	$ 0.0
Repurchase limit in percentage of amount of average net receivables	16.00%
Total purchase obligation	$ 9.7
Additional floor plan lenders
COMMITMENTS AND CONTINGENCIES
Total purchase obligation	$ 3.5

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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.

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- Definition

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

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No definition available.

+ Details

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- Definition

The amount of liability related to repurchase outstanding.

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No definition available.

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- Definition

Costs associated with repurchases under repurchase obligations.

+ References

No definition available.

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Namespace Prefix:	mpx_
Data Type:	xbrli:monetaryItemType
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- Definition

Amount of net realizable value of repurchased inventory under repurchase obligations.

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No definition available.

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- Definition

Redistributed amounts under repurchase obligations.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Amount of repurchases of inventory under contractual agreements.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
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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_
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Balance Type:	credit
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- Details

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