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EMPLOYEE BENEFIT PLANS (Detail Textuals 2) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Tax benefits for compensation expense for restricted stock | $ 342,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | $ 136,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | $ 379,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Proceeds received upon exercise of stock options |  |  | 467,000 us-gaap_ProceedsFromStockOptionsExercised
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Minimum threshold limit percentage of incentive stock option grants to owners | 10.00%mpx_MinimumThresholdLimitPercentageOfIncentiveStockOptionGrantsToOwners / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Percentage of fair market value of the common stock | 110.00%mpx_PercentageOfFairMarketValueOfCommonStock / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Stock based compensation award, vesting period | 5 years |  |
Expiry period of the stock | 10 years |  |
Expiry period of the stock of the majority owners | 5 years |  |
Fair value of stock options method used | Black-Scholes option pricing model |  |
Total intrinsic value of share options exercised |  |  | 941,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock based compensation award, vesting period | 10 years |  |
Stock based compensation award, vesting percentage | 20.00%mpx_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Stock based compensation award, vesting period from date of grant | 6 years |  |
Weighted average grant date fair value (in dollars per share) | $ 7.90 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 6.40 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 5.59 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Total fair value of shares vested | 2,295,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 1,457,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 1,169,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Tax benefits for compensation expense for restricted stock | 342,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 136,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 379,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Unrecognized compensation cost related to non-vested restricted shares | 6,638,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Period for recognition of compensation cost related to non-vested restricted shares | 3.4 years |  |
Proceeds received upon exercise of stock options |  |  | 467,000 us-gaap_ProceedsFromStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Fair value of shares tendered to exercise under employee stock options |  |  | $ 823,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember

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- Definition Represents the period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition from date of grant, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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