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Accounts Receivable - Schedule of Changes in Sales Return Reserve (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Beginning balance $ (1,205)mx_AllowanceForSalesReturns $ (1,264)mx_AllowanceForSalesReturns
Provisions (3,224)mx_AllowanceForSalesReturnsAdditions (1,218)mx_AllowanceForSalesReturnsAdditions
Usage 3,598mx_AllowanceForSalesReturnsWriteoffs 1,296mx_AllowanceForSalesReturnsWriteoffs
Translation adjustments 44mx_AllowanceForSalesReturnsTranslationAdjustments (19)mx_AllowanceForSalesReturnsTranslationAdjustments
Ending balance $ (787)mx_AllowanceForSalesReturns $ (1,205)mx_AllowanceForSalesReturns