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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2014 | Dec. 31, 2011
Income Taxes [Line Items] |  |  |  |  |
Deferred tax assets for net operating losses that arose directly from tax deductions attributable to windfall income tax benefits, not realized |  | $ 4,600,000 mat_DeferredTaxAssetsRelatedToWindfallTaxBenefitsFromEquityCompensationNotRealized |  |  |
Deferred tax assets for net operating losses that arose directly from tax deductions attributable to windfall income tax benefits, realized | 4,600,000 mat_DeferredTaxAssetsRelatedToWindfallTaxBenefitsFromEquityCompensationRealized |  |  |  |
Loss carryforwards | 869,940,000 us-gaap_OperatingLossCarryforwards |  |  |  |
Tax credit carryforwards | 72,469,000 mat_DeferredTaxAssetsTaxCreditCarryforward |  |  |  |
Deferred income tax asset valuation allowances | 133,297,000 us-gaap_DeferredTaxAssetsValuationAllowance | 64,641,000 us-gaap_DeferredTaxAssetsValuationAllowance |  |  |
Percentage greater than threshold of Income tax examination of uncertain tax positions that should be recognized | 50.00%mat_PercentageGreaterThanThresholdOfIncomeTaxExaminationMinimumLikelihoodOfTaxBenefitsBeingRealizedUponSettlement |  |  |  |
Net deferred income tax assets | 455,712,000 us-gaap_DeferredTaxAssetsLiabilitiesNet | 454,210,000 us-gaap_DeferredTaxAssetsLiabilitiesNet |  |  |
Unrecognized tax benefits, end of period | 100,357,000 us-gaap_UnrecognizedTaxBenefits | 111,370,000 us-gaap_UnrecognizedTaxBenefits | 285,560,000 us-gaap_UnrecognizedTaxBenefits |  | 262,560,000 us-gaap_UnrecognizedTaxBenefits
Amount of unrecognized tax benefits that would impact the effective tax rate if recognized | 96,800,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |  |
Recognized interest and penalties related to unrecognized tax benefits | 2,400,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense |  |  |  |
Accrued interest and penalties related to unrecognized tax benefits | 18,100,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |  |  |
Amount of unrecognized tax benefits related to interest and penalties that would impact the effective tax rate if recognized | 17,500,000 mat_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRateIncomeTaxPenaltiesAndInterestAccrued |  |  |  |
Unrecognized tax benefits |  |  |  | 44,000,000 mat_ReclassificationOfUnrecognizedTaxBenefits |
Reasonably possible changes to unrecognized tax benefits related to settlement of tax audits and/or expiration of statutes of limitations within the next twelve months | 8,700,000 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit |  |  |  |
Net tax benefit | 42,600,000 mat_NetTaxBenefitExpense | 32,200,000 mat_NetTaxBenefitExpense | 16,000,000 mat_NetTaxBenefitExpense |  |
Cumulative amount of undistributed earnings of foreign subsidiaries that is intended to be indefinitely reinvested and for which no deferred US income taxes have been provided | 6,400,000,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |  |
Increase to additional paid-in-capital for related windfall income tax benefits resulting from the exercise of nonqualified stock options and vesting of other stock compensation awards | 21,187,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 50,374,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 35,798,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |
California |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Remaining periods subject to examination | 2008 through 2014 tax years |  |  |  |
New York |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Remaining periods subject to examination | 2007 through 2014 tax years |  |  |  |
Wisconsin |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Remaining periods subject to examination | 2008 through 2014 tax years |  |  |  |
Hong Kong |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Remaining periods subject to examination | 2008 through 2014 tax years |  |  |  |
Brazil |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Remaining periods subject to examination | 2009 through 2014 tax years |  |  |  |
Mexico |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Remaining periods subject to examination | 2009 through 2014 tax years |  |  |  |
Netherlands |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Remaining periods subject to examination | 2009 through 2014 tax years |  |  |  |
Russia |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Remaining periods subject to examination | 2011 through 2014 tax years |  |  |  |
Valuation Allowances Net Operating Losses and Tax Credit Carryforwards |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred income tax asset valuation allowances | 92,600,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = mat_ValuationAllowancesNetOperatingLossesAndTaxCreditCarryforwardsMember |  |  |  |
Valuation Allowance for Other Deferred Tax Assets |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred income tax asset valuation allowances | $ 40,700,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = mat_ValuationAllowanceForOtherDeferredTaxAssetsMember |  |  |  |

X
- Definition Amount of deferred tax assets arising directly from windfall tax benefits equity compensation that was not recognized as a deferred tax asset and credit to additional paid-in capital as of the end of the year. Additional paid-in capital will increase when the deferred tax assets are realized. + References No definition available. + Details
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- Definition Amount of deferred tax assets arising directly from windfall tax benefits equity compensation that was not recognized as a deferred tax asset and credit to additional paid-in capital as of the end of the prior year. Additional paid-in capital was increased in the current year as the deferred tax assets were realized. + References No definition available. + Details
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- Definition Reclassification of unrecognized tax benefits related to the adoption of ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. + References No definition available. + Details
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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 + Details
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