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Quarterly Financial Information (Unaudited) (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012
Quarterly Financial Information [Line Items] |  |  |  |  |  |
Net tax benefit | $ 17.0 | $ 11.2 | $ 4.0 |  | $ 5.5 | $ 10.5
Net litigation charge |  |  |  | 87.1 |  |
Litigation charge |  |  |  | $ 137.8 |  |

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- Definition Gross litigation charge recognized during the period. + References No definition available. + Details
Name: | mat_LitigationChargeGross
Namespace Prefix: | mat_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Litigation charge recognized during the period, net of tax. + References No definition available. + Details
Name: | mat_LitigationChargeNet
Namespace Prefix: | mat_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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