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Segment Information - Additional Information (Detail) - Brand | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting [Abstract] |  |  |
Number of brands | 4 |  |
Percentage of total consolidated net sales accounted by three largest customers | 37.00% | 39.00% | 37.00%

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- 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

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- Definition Percentage of total consolidated net sales accounted for by three largest customers. + References No definition available. + Details
Name: | mat_PercentageOfTotalConsolidatedNetSalesAccountedForByThreeLargestCustomers
Namespace Prefix: | mat_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration