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Valuation and Qualifying Accounts and Allowances (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012
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Valuation and Qualifying Accounts Disclosure [Line Items] |
Allowance for doubtful account | $ 12.8

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- Definition An allowance for doubtful accounts related to a transaction that was not recognized in the statement of operations as the transaction did not meet the relevant revenue recognition criteria. + References No definition available. + Details
Name: | mat_AllowanceForDoubtfulAccountsNotRecognizedInStatementOfOperations
Namespace Prefix: | mat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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