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Accounts Receivable - Schedule of Changes in Low Yield Compensation Reserve (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Beginning balance $ (1,951)mx_LowYieldCompensationReserve $ (3,206)mx_LowYieldCompensationReserve
Provisions (766)mx_LowYieldCompensationReserveAdditions (1,868)mx_LowYieldCompensationReserveAdditions
Usage 1,563mx_LowYieldCompensationReserveWriteoffs 3,150mx_LowYieldCompensationReserveWriteoffs
Translation adjustments 54mx_LowYieldCompensationReserveTranslationAdjustments (27)mx_LowYieldCompensationReserveTranslationAdjustments
Ending balance $ (1,100)mx_LowYieldCompensationReserve $ (1,951)mx_LowYieldCompensationReserve