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Reconciliation of Provision for Income Taxes at US Federal Statutory Rate to Provision in Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Statutory Federal Tax Rate [Line Items]
Provision at US federal statutory rate	$ 205,419us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 384,695us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 330,766us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Foreign earnings taxed at different rates, including withholding taxes	(107,409)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(165,768)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(157,488)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Foreign losses without income tax benefit	20,140mat_ForeignLossesWithoutIncomeTaxBenefit	3,215mat_ForeignLossesWithoutIncomeTaxBenefit	1,047mat_ForeignLossesWithoutIncomeTaxBenefit
State and local taxes, net of US federal benefit	3,760us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	4,854us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	6,856us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Adjustments to previously accrued taxes	(55,026)mat_NetTaxBenefitExpenseExcludingOffsetForTaxRestructuring	(32,200)mat_NetTaxBenefitExpenseExcludingOffsetForTaxRestructuring	(16,000)mat_NetTaxBenefitExpenseExcludingOffsetForTaxRestructuring
Tax restructuring	12,400mat_NetTaxExpenseRelatedToTaxRestructuring
Other	8,752us-gaap_IncomeTaxReconciliationOtherReconcilingItems	388us-gaap_IncomeTaxReconciliationOtherReconcilingItems	3,400us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Provision for income taxes	$ 88,036us-gaap_IncomeTaxExpenseBenefit	$ 195,184us-gaap_IncomeTaxExpenseBenefit	$ 168,581us-gaap_IncomeTaxExpenseBenefit

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Foreign Losses Without Income Tax Benefit.

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Net Tax Benefit Expense Excluding Offset For Tax Restructuring.

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Net Tax Expense Related To Tax Restructuring.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.4-08.(h))

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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