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Segment Information - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Disclosure [Line Items] |  |  |
Percentage of total consolidated net sales accounted by three largest customers | 35.00%mat_PercentageOfTotalConsolidatedNetSalesAccountedForByThreeLargestCustomers | 36.00%mat_PercentageOfTotalConsolidatedNetSalesAccountedForByThreeLargestCustomers | 37.00%mat_PercentageOfTotalConsolidatedNetSalesAccountedForByThreeLargestCustomers

X
- 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

X
- Details
Name: | mat_SegmentReportingDisclosureLineItems
Namespace Prefix: | mat_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration