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Accrued Severance Benefits - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2022
Percentage of employees eligible for severance benefits	97.00%
Korea [Member] | Maximum [Member]
Korea's mandatory retirement age	60 years

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- Definition

Employees eligible for severance benefits percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	mx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

Korea's mandatory retirement age.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_StatementGeographicalAxis=country_KR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: