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Employee Benefit Plans - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($)
Employee Benefits Disclosure [Line Items]
Cash contributions made for defined benefit pension benefit plans	$ 8
Cash contributions made for postretirement benefit plans	1
Expected additional cash contributions	28
Expected lump sum benefit payments for unfunded plans	$ 22

X

- Definition

Employee Benefits Disclosure [Line Items]

+ References

No definition available.

+ 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

Name:	us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
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 non-pension postretirement benefits.

+ 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The amount of cash or cash equivalents contributed by the entity to fund its pension 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

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