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Employee Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Employee Benefits Disclosure [Line Items]
Cash contributions made for defined benefit pension and postretirement benefit plans	$ 8us-gaap_PensionAndOtherPostretirementBenefitContributions
Expected additional cash contributions	29us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
Expected lump sum benefit payments for unfunded plans	$ 22mat_ExpectedLumpSumBenefitPaymentsForUnfundedPlans

X

- Details

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

X

- Definition

Expected Lump Sum Benefit Payments for Unfunded Plans

+ References

No definition available.

+ Details

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

X

- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

+ Details

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Balance Type:	credit
Period Type:	duration