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WARRANTY COSTS AND OTHER CONTINGENCIES - Warranty Costs (Details) | 3 Months Ended
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Mar. 31, 2020
Warranty Costs: |
Warranty Term (in years) | 1 year
Termination period after date of purchase (in years) | 5 years
Second subsequent owner |
Warranty Costs: |
Warranty Term (in years) | 1 year
Hull warranty term (in years) | 5 years
Minimum |
Warranty Costs: |
Additional items warranty term (in years) | 1 year
Maximum |
Warranty Costs: |
Additional items warranty term (in years) | 5 years
Chaparral |
Warranty Costs: |
Structural deck warranty term (in years) | 5 years
Termination period after date of purchase (in years) | 5 years

X
- Definition Represents the term of warranty (in years). + References No definition available. + Details
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- Definition Represents term of transferable hull warranty terminates after the date of the original retail purchase. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
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Period Type: | duration

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- Definition Represents term of transferable warranty for structural deck. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents term of transferable warranty for structural hull. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
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- Definition Represents the term of warranty for additional items not covered by deck or hall warranty. + References No definition available. + Details
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Namespace Prefix: | mpx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mpx_ChaparralProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |