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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ (1,969)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (853)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Change during period:    
Before-tax amount (10)us-gaap_OtherComprehensiveIncomeLossBeforeTax 7us-gaap_OtherComprehensiveIncomeLossBeforeTax
Tax provision/benefit 3us-gaap_OtherComprehensiveIncomeLossTax (4)us-gaap_OtherComprehensiveIncomeLossTax
Reclassification adjustment, net of taxes    
Amortization of net loss 12mpx_AccumulatedOtherComprehensiveIncomeLossAmortizationOfNetLossGain [1] 6mpx_AccumulatedOtherComprehensiveIncomeLossAmortizationOfNetLossGain [1]
Net realized gain 21us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [2] 1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [2]
Total activity for the period 26us-gaap_OtherComprehensiveIncomeLossNetOfTax 10us-gaap_OtherComprehensiveIncomeLossNetOfTax
Balance (1,943)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (843)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Pension Adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (2,024)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 (990)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Change during period:    
Before-tax amount      
Tax provision/benefit      
Reclassification adjustment, net of taxes    
Amortization of net loss 12mpx_AccumulatedOtherComprehensiveIncomeLossAmortizationOfNetLossGain
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [1] 6mpx_AccumulatedOtherComprehensiveIncomeLossAmortizationOfNetLossGain
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [1]
Net realized gain    [2]    [2]
Total activity for the period 12us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 6us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Balance (2,012)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 (984)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Unrealized Gain on Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 55us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 137us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Change during period:    
Before-tax amount (10)us-gaap_OtherComprehensiveIncomeLossBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 7us-gaap_OtherComprehensiveIncomeLossBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Tax provision/benefit 3us-gaap_OtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 (4)us-gaap_OtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Reclassification adjustment, net of taxes    
Amortization of net loss    [1]    [1]
Net realized gain 21us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 [2] 1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 [2]
Total activity for the period 14us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 4us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Balance $ 69us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 $ 141us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
[1] Reported as part of selling, general and administrative expenses.
[2] Reported as part of interest income.