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STOCK-BASED COMPENSATION (Detail Textuals 3) (Restricted Stock, USD $)	3 Months Ended
	Mar. 31, 2013
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested restricted shares	$ 7,522,000
Unrecognized compensation cost related to non-vested restricted shares recognized period	4.30 years

X

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate unrecognized cost of share-based awards, other than options, made to employees under an equity-based compensation plan, that have yet to vest.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration