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MARKETABLE SECURITIES - Amortized cost basis, fair value and net unrealized gains on available-for-sale securities (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	$ 34,752us-gaap_AvailableForSaleSecuritiesAmortizedCost	$ 37,399us-gaap_AvailableForSaleSecuritiesAmortizedCost
Fair Value	34,859us-gaap_AvailableForSaleSecurities	37,484us-gaap_AvailableForSaleSecurities
Net Unrealized Gains (Losses)	107mpx_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInAoci	85mpx_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInAoci
Municipal Obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	29,253us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_MunicipalNotesMember	31,990us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_MunicipalNotesMember
Fair Value	29,342us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_MunicipalNotesMember	32,080us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_MunicipalNotesMember
Net Unrealized Gains (Losses)	89mpx_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInAoci / us-gaap_DebtSecurityAxis = us-gaap_MunicipalNotesMember	90mpx_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInAoci / us-gaap_DebtSecurityAxis = us-gaap_MunicipalNotesMember
Corporate obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	5,499us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember	5,409us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember
Fair Value	5,517us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember	5,404us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember
Net Unrealized Gains (Losses)	$ 18mpx_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInAoci / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember	$ (5)mpx_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInAoci / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember

X

- Definition

Net amount of accumulated unrealized gains (losses) on investments in available-for-sale securities that are recognized in Accumulated Other Comprehensive Income (AOCI).

+ References

No definition available.

+ Details

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Namespace Prefix:	mpx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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