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EARNINGS PER SHARE (Detail Textuals) (Restricted Shares, USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Restricted Shares
Earnings Per Share [Line Items]
Reduction in reported basic earnings per share under the two class method	$ 0.01	$ 0.01

X

- Details

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

X

- Definition

Represents the amount of reduction in basic earining per share.

+ References

No definition available.

+ Details

Name:	mpx_ReductionInBasicEarningsPerShare
Namespace Prefix:	mpx_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration