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COMMITMENTS AND CONTINGENCIES - Short-term Cash Incentive Compensation (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 21 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2023 employee | Sep. 30, 2023 USD ($) employee | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) employee | Sep. 30, 2022 USD ($) | Sep. 30, 2023 employee
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |
Number of non-executive employee |  | 4 |  | 4 |  | 4
Pre-tax profit incentive percentage |  |  |  |  |  | 16.00%
Number of non-executive employee subject to contractual agreement |  | 1 |  | 1 |  | 1
Pre-tax profit incentive percentage subject to contractual agreement |  |  |  | 7.00% |  |
Pre-tax profit incentive percentage subject to discretionary determination | 9.00% |  |  |  |  |
Number of non-executive employee, subject to discretionary determination | 3 |  |  |  |  |
STCI expense | $ |  | $ 2,365 | $ 3,414 | $ 9,650 | $ 8,699 |

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

X
- Definition Number of non-executive employee covered under STCI. + References No definition available. + Details
Name: | mpx_ShortTermCashIncentiveCompensationNumberOfNonExecutiveEmployee
Namespace Prefix: | mpx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of non-executive employee covered under STCI subject to contractual agreement. + References No definition available. + Details
Name: | mpx_ShortTermCashIncentiveCompensationNumberOfNonExecutiveEmployeeSubjectToContractualAgreement
Namespace Prefix: | mpx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of non-executive employee covered under STCI subject to discretionary determination. + References No definition available. + Details
Name: | mpx_ShortTermCashIncentiveCompensationNumberOfNonExecutiveEmployeeSubjectToDiscretionaryDetermination
Namespace Prefix: | mpx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of short term cash incentive compensation pre-tax profit incentive. + References No definition available. + Details
Name: | mpx_ShortTermCashIncentiveCompensationPreTaxProfitIncentivePercentage
Namespace Prefix: | mpx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

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

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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