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Summary of Changes in Benefit Obligation and Plan Assets for Defined Benefit Pension and Postretirement Benefit Plans (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Defined Benefit Plan Disclosure [Line Items] |  |
Tax benefits related to changes in benefit obligation and plan assets which are also included in accumulated other comprehensive loss | $ 88.0 mat_TaxBenefitsRelatedToBenefitPlansIncludedInAccumulatedOtherComprehensiveLoss | $ 70.2 mat_TaxBenefitsRelatedToBenefitPlansIncludedInAccumulatedOtherComprehensiveLoss

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- Definition Tax benefits related to benefit plans included in accumulated other comprehensive loss + References No definition available. + Details
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Namespace Prefix: | mat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Balance Type: | na
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