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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 | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan assets transferred to plan upon conversion | $ 12 |
Tax benefits related to changes in benefit obligation and plan assets which are also included in accumulated other comprehensive loss | $ 102.7 | $ 70.2

X
- Definition Value of assets transferred into a defined benefit plan upon a plan conversion. + References No definition available. + Details
Name: | mat_DefinedBenefitPlanAssetsTransferredToPlanUponConversion
Namespace Prefix: | mat_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration