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COMMITMENTS AND CONTINGENCIES - Short-term Cash Incentive Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	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

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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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

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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