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Accrued Severance Benefits - Changes in Accrued Severance Benefits (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Postemployment Benefits [Abstract]
Beginning balance	$ 41,581	$ 44,198	$ 45,594	$ 45,932
Provisions	693	1,582	2,868	4,552
Severance payments	(826)	(527)	(10,669)	(1,889)
Translation adjustments	(1,357)	2,368	2,298	(974)
Ending balance	40,091	47,621	40,091	47,621
Less: Cumulative contributions to severance insurance deposit accounts	(25,859)	(30,246)	(25,859)	(30,246)
The National Pension Fund	(19)	(28)	(19)	(28)
Accrued severance benefits, net	$ 14,213	$ 17,347	$ 14,213	$ 17,347	$ 17,094

X

- Definition

Cumulative contributions to national pension fund.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Cumulative contributions to severance insurance deposit accounts.

+ References

No definition available.

+ Details

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Namespace Prefix:	mx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Postemployment benefits provisions.

+ References

No definition available.

+ Details

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Namespace Prefix:	mx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Postemployment benefits severance payments.

+ References

No definition available.

+ Details

Name:	mx_PostemploymentBenefitsSeverancePayments
Namespace Prefix:	mx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Postemployment benefits translation adjustment.

+ References

No definition available.

+ Details

Name:	mx_PostemploymentBenefitsTranslationAdjustment
Namespace Prefix:	mx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- References

No definition available.

+ Details

Name:	us-gaap_PostemploymentBenefitsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The carrying amount as of the balance sheet date of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(15))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 712
-SubTopic 10
-Name Accounting Standards Codification
-Section 25
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481179/712-10-25-4

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 712
-SubTopic 10
-Name Accounting Standards Codification
-Section 25
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481179/712-10-25-5

+ Details

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Balance Type:	credit
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X

- Definition

Liability for amount due employees, in addition to wages and any other money that employers owe employees, when their employment ends through a layoff or other termination. For example, a company may provide involuntarily terminated employees with a lump sum payment equal to one week's salary for every year of employment.

+ References

No definition available.

+ Details

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