XML 105 R76.htm IDEA: XBRL DOCUMENT v3.3.1.900

Fixed Assets - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Property Plant and Equipment Useful Life and Values [Abstract]
Construction in progress expenditures	$ 1,300.0	$ 942.0

X

- Definition

Property Plant and Equipment Useful Life and Values [Abstract]

+ References

No definition available.

+ Details

Name:	mga_PropertyPlantAndEquipmentUsefulLifeAndValuesAbstract
Namespace Prefix:	mga_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant