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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
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | $ 34,752 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 37,399 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Fair Value | 34,859 us-gaap_AvailableForSaleSecurities | 37,484 us-gaap_AvailableForSaleSecurities
Net Unrealized Gains (Losses) | 107 mpx_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInAoci | 85 mpx_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInAoci
Municipal Obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 29,253 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_MunicipalNotesMember | 31,990 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_MunicipalNotesMember
Fair Value | 29,342 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_MunicipalNotesMember | 32,080 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_MunicipalNotesMember
Net Unrealized Gains (Losses) | 89 mpx_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInAoci / us-gaap_DebtSecurityAxis = us-gaap_MunicipalNotesMember | 90 mpx_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInAoci / us-gaap_DebtSecurityAxis = us-gaap_MunicipalNotesMember
Corporate obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 5,499 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember | 5,409 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember
Fair Value | 5,517 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember | 5,404 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember
Net Unrealized Gains (Losses) | $ 18 mpx_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInAoci / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember | $ (5)mpx_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInAoci / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember

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- 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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- 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 + Details
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- 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 + Details
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