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SUBSEQUENT EVENT (Detail Textuals) (Subsequent Event, Dividend Declared, USD $)	1 Months Ended
	Oct. 24, 2012
Subsequent Event | Dividend Declared
Subsequent Event [Line Items]
Cash dividends, common stock declared (in dollars per share)	$ 0.02
Special dividends, common stock declared (in dollars per share)	$ 0.55

X

- Definition

Aggregate special dividends declared during the period for each share of common stock outstanding.

+ References

No definition available.

+ Details

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

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Details

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