Early Termination Charges (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Early Termination Charges [Abstract]
Minimum requisite period of service for voluntary resignation program	20 years
Early termination charges	$ 8,449	$ 0

Minimum requisite period of service for voluntary resignation program, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	mx_MinimumRequisitePeriodOfServiceForVoluntaryResignationProgram
Namespace Prefix:	mx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration