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Equity Incentive Plans - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options period shall not exceed from the date of grant 10 years    
Number of shares authorized 5,221us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized    
Number of shares reserved for future issuance 553us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Fair values of restricted stock bonuses released from restriction     $ 1,818mx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndRestrictedStockVestedInPeriodFairValue
Fair value of options vested 1,746us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 1,515us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 1,565us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options vesting period 3 years    
Common stock vesting percentage 34.00%mx_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Allocated share based compensation expense 2,213us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
2,389us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1,334us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Unrecognized compensation cost related to stock options 1,357us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Unrecognized compensation cost related to stock options, period for recognition 8 months 12 days    
Options [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock vesting percentage on completion of three-month 8.00%mx_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPercentageOnCompletionOfThreeMonth
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Options [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock vesting percentage on completion of three-month 9.00%mx_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPercentageOnCompletionOfThreeMonth
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Restricted stock bonuses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation expense     $ 882us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= mx_RestrictedStockAndStockBonusesMember