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Accrued Severance Benefits - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2025
Percentage of employees eligible for severance benefits	97.00%
Retirement age of employees	60 years
Korea [Member] | Minimum [Member]
Korea's mandatory retirement age	60 years

X

- 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

X

- 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

- Definition

Retirement age of employees.

+ 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_MinimumMember
Namespace Prefix:
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Balance Type:
Period Type: