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

X

- 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

X

- Details

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