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COMPARATIVE FIGURES | 12 Months Ended
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Dec. 31, 2012
COMPARATIVE FIGURES | 24. COMPARATIVE FIGURES Certain of the comparative figures have been reclassified to conform to the current year’s method of presentation.

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- Definition Comparative figures. + References No definition available. + Details
Name: | mga_ComparativeFiguresTextBlock
Namespace Prefix: | mga_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration