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COMMITMENTS AND CONTINGENCIES - Income taxes and short term cash incentive compensation (Details) $ in Thousands |  | 9 Months Ended | 12 Months Ended | 33 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2023 employee | Sep. 30, 2023 employee | Dec. 31, 2023 USD ($) employee | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2023 employee
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |
Long-term deferred tax liabilities | $ |  |  | $ 1,300 | $ 1,100 |  |
Number of non-executive employee |  |  | 4 |  |  |
Pre-tax profit incentive percentage |  |  |  |  |  | 16.00%
Number of non-executive employee subject to contractual agreement |  | 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 | $ |  |  | $ 10,651 | $ 12,039 | $ 8,535 |

X
- Definition Amount of pre tax short-term cash incentive compensation incurred during the reporting period. + References No definition available. + Details
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Balance Type: | debit
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X
- Definition Number of non-executive employee covered under STCI. + References No definition available. + Details
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Namespace Prefix: | mpx_
Data Type: | xbrli:integerItemType
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X
- Definition Number of non-executive employee covered under STCI subject to contractual agreement. + References No definition available. + Details
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- Definition Number of non-executive employee covered under STCI subject to discretionary determination. + References No definition available. + Details
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X
- Definition Percentage of short term cash incentive compensation pre-tax profit incentive. + References No definition available. + Details
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Namespace Prefix: | mpx_
Data Type: | dtr-types:percentItemType
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X
- Definition Percentage of pre-tax profit incentive subject to contractual agreement. + References No definition available. + Details
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Namespace Prefix: | mpx_
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- Definition Percentage of pre-tax profit incentive subject to discretionary determination. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482525/740-10-45-6 + Details
Name: | us-gaap_DeferredTaxLiabilities
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Balance Type: | credit
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