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Quarterly Financial Information (Unaudited) (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012
Quarterly Financial Information [Line Items]
Net tax benefit	$ 17.0	$ 11.2	$ 4.0		$ 5.5	$ 10.5
Net litigation charge				87.1
Litigation charge				$ 137.8

X

- Definition

Gross litigation charge recognized during the period.

+ References

No definition available.

+ Details

Name:	mat_LitigationChargeGross
Namespace Prefix:	mat_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Litigation charge recognized during the period, net of tax.

+ References

No definition available.

+ Details

Name:	mat_LitigationChargeNet
Namespace Prefix:	mat_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Net Tax Benefit

+ References

No definition available.

+ Details

Name:	mat_NetTaxExpenseBenefit
Namespace Prefix:	mat_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	mat_QuarterlyFinancialInformationLineItems
Namespace Prefix:	mat_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration