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Business, Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Business_Lines
Dec. 31, 2013
Dec. 31, 2012
Nature Of Operations [Line Items]      
Number of business lines 3mx_NumberOfBusinessLines    
Cash equivalents, highly liquid investments original maturity date Three months or less    
Percentage of employees eligible for severance benefits 98.00%mx_EmployeesEligibleForSeveranceBenefitsPercentage    
Advertising expense $ 155,000us-gaap_AdvertisingExpense $ 161,000us-gaap_AdvertisingExpense $ 142,000us-gaap_AdvertisingExpense
Standard limited warranty period The standard limited warranty period is one year for the majority of products.    
Dividends 0us-gaap_Dividends    
Percentage of tax benefit realized upon settlement 50.00%mx_IncomeTaxRecognizedTaxPositionRealizedUponUltimateSettlement    
Selling, general and administrative expenses [Member]      
Nature Of Operations [Line Items]      
Shipping and handling cost $ 3,386,000us-gaap_ShippingHandlingAndTransportationCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
$ 2,850,000us-gaap_ShippingHandlingAndTransportationCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
$ 3,057,000us-gaap_ShippingHandlingAndTransportationCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
Software [Member]      
Nature Of Operations [Line Items]      
Estimated useful life of Intangible assets 5 years    
Minimum [Member] | Technology [Member]      
Nature Of Operations [Line Items]      
Estimated useful life of Intangible assets 1 year    
Minimum [Member] | Customer relationships [Member]      
Nature Of Operations [Line Items]      
Estimated useful life of Intangible assets 1 year    
Maximum [Member] | Technology [Member]      
Nature Of Operations [Line Items]      
Estimated useful life of Intangible assets 5 years    
Maximum [Member] | Customer relationships [Member]      
Nature Of Operations [Line Items]      
Estimated useful life of Intangible assets 5 years    
Maximum [Member] | Intellectual property assets [Member]      
Nature Of Operations [Line Items]      
Estimated useful life of Intangible assets 10 years