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Segment Information - Narrative (Details)	9 Months Ended
	Sep. 30, 2017 Brand
Segment Reporting [Abstract]
Number of brands (in brand)	4

X

- Definition

Number of Brands

+ References

No definition available.

+ Details

Name:	mat_NumberofBrands
Namespace Prefix:	mat_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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