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SIGNIFICANT ACCOUNTING POLICIES (Detail Textuals) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Segment
Dec. 31, 2013
Dec. 31, 2012
Concentration Risk [Line Items]      
Number of reportable segment 1us-gaap_NumberOfReportableSegments    
Net sales from all dealers $ 171,050us-gaap_SalesRevenueNet $ 168,293us-gaap_SalesRevenueNet $ 148,950us-gaap_SalesRevenueNet
Net Sales | International Dealer      
Concentration Risk [Line Items]      
Net sales from all dealers $ 26,000us-gaap_SalesRevenueNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ mpx_DealerAxis
= mpx_InternationalDealerMember		 $ 29,000us-gaap_SalesRevenueNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ mpx_DealerAxis
= mpx_InternationalDealerMember		 $ 30,000us-gaap_SalesRevenueNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ mpx_DealerAxis
= mpx_InternationalDealerMember
Net Sales | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration risk, customer No single dealer accounted for more than 10 percent of net sales No single dealer accounted for more than 10 percent of net sales No single dealer accounted for more than 10 percent of net sales
Concentration risk, benchmark description more than 10 percent more than 10 percent more than 10 percent