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Quarterly Financial Information (Unaudited) (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |
Net tax benefit (expense) | $ (8.9)mat_NetTaxExpenseBenefit | $ 15.1 mat_NetTaxExpenseBenefit | $ 40.1 mat_NetTaxExpenseBenefit | $ (3.7)mat_NetTaxExpenseBenefit | $ 17.0 mat_NetTaxExpenseBenefit | $ 11.2 mat_NetTaxExpenseBenefit | $ 4.0 mat_NetTaxExpenseBenefit

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- Definition Net Tax (Expense) Benefit + References No definition available. + Details
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Namespace Prefix: | mat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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