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v3.8.0.1

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