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Long-Term Employee Benefit Liabilities (Details Textual)	12 Months Ended
	Dec. 31, 2011 Age
Long-Term Employee Benefit Liabilities [Abstract]
Minimum age required to be eligible for Retirement medical benefits plan	60
Minimum service period required to be eligible for Retirement medical benefits plan	10

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- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

Name:	mga_MinimumAgeRequiredToBeEligibleForRetirementMedicalBenefitsPlan
Namespace Prefix:	mga_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

Name:	mga_MinimumServicePeriodRequiredToBeEligibleForRetirementMedicalBenefitsPlan
Namespace Prefix:	mga_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- Details

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