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COMMITMENTS AND CONTINGENCIES - Short-term Cash Incentive Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
COMMITMENTS AND CONTINGENCIES |  |  |  |
Pre-tax profit incentive percentage subject to discretionary determination |  |  | 9.00% |
STCI expense | $ 581 | $ 436 | $ 2,097 | $ 1,949

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- Definition Amount of pre tax short-term cash incentive compensation incurred during the reporting period. + References No definition available. + Details
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Namespace Prefix: | mpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of pre-tax profit incentive subject to discretionary determination. + References No definition available. + Details
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Namespace Prefix: | mpx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration