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Valuation and Qualifying Accounts and Allowances (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2012
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Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Allowance for doubtful account |  | $ 12.8 mat_AllowanceForDoubtfulAccountsNotRecognizedInStatementOfOperations
Income tax valuation allowance | $ 70.9 mat_IncomeTaxValuationAllowanceNotRecognizedInStatementOfOperations |

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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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- Definition An income tax valuation allowance that was not recognized in the statement of operations as it related to acquired net assets in a business combination. + References No definition available. + Details
Name: | mat_IncomeTaxValuationAllowanceNotRecognizedInStatementOfOperations
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