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Seasonal Financing and Debt - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
May 31, 2014
Mar. 31, 2013
Dec. 31, 2014
Debt Instrument [Line Items]        
Consolidated debt-to-earnings before interest taxes depreciation amortization ratio as calculated for covenant compliance       230.00%mat_ConsolidatedDebtToEarningsBeforeInterestTaxesDepreciationAmortizationRatioAsCalculatedForCovenantCompliance
Debt-to-earnings before interest taxes depreciation amortization ratio maximum for covenant compliance       300.00%mat_DebtToEarningsBeforeInterestTaxesDepreciationAmortizationRatioMaximumForCovenantCompliance
Interest coverage ratio as calculated for covenant compliance       1155.00%mat_InterestCoverageRatioAsCalculatedForCovenantCompliance
Interest coverage ratio minimum for covenant compliance       350.00%mat_InterestCoverageRatioMinimumForCovenantCompliance
Foreign credit lines available       340,000,000mat_ForeignCreditLinesAvailable
Outstanding amounts of accounts receivable sold under international factoring arrangements 25,600,000mat_OutstandingAmountsOfAccountsReceivableSold     22,300,000mat_OutstandingAmountsOfAccountsReceivableSold
Short term bank loans outstanding 4,278,000us-gaap_ShortTermBorrowings      
Repayment of Medium-term notes 50,000,000us-gaap_RepaymentsOfMediumTermNotes      
2014 Senior Notes due May 2019        
Debt Instrument [Line Items]        
Principal of debt instrument   500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyFourteenDueMayTwentyNineteenMember		    
Debt instrument maturity date   May 06, 2019    
Issuance date   2014-05    
Interest rate   2.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyFourteenDueMayTwentyNineteenMember		    
Interest terms   Interest on the 2014 Senior Notes is payable semi-annually on May 6 and November 6 of each year, beginning November 6, 2014.    
Redemption terms   Mattel may redeem all or part of the 2014 Senior Notes at any time or from time to time at its option, at a redemption price equal to the greater of (i) 100% of the principal amount of the notes being redeemed plus accrued and unpaid interest to, but excluding, the redemption date, and (ii) a "make-whole" amount based on the yield of a comparable US Treasury security plus 12.5 basis points.    
Redemption price option one   100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyFourteenDueMayTwentyNineteenMember		    
Redemption price option two   0.125%mat_DebtRedemptionPriceBasisPointsAboveComparableUnitedStatesTreasurySecurity
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyFourteenDueMayTwentyNineteenMember		    
2013 Senior Notes due March 2018        
Debt Instrument [Line Items]        
Principal of debt instrument     250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyThirteenDueMarchTwentyEighteenMember		  
Debt instrument maturity date     Mar. 15, 2018  
Issuance date     2013-03  
Interest rate     1.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyThirteenDueMarchTwentyEighteenMember		  
Interest terms     Interest on the 2013 Senior Notes is payable semi-annually on March 15 and September 15 of each year, beginning September 15, 2013.  
Redemption terms     Mattel may redeem all or part of the 1.70% Senior Notes at any time or from time to time at its option, at a redemption price equal to the greater of (i) 100% of the principal amount of the notes being redeemed plus accrued and unpaid interest to, but excluding, the redemption date, and (ii) a "make-whole" amount based on the yield of a comparable US Treasury security plus 15 basis points.  
Redemption price option one     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyThirteenDueMarchTwentyEighteenMember		  
Redemption price option two     0.15%mat_DebtRedemptionPriceBasisPointsAboveComparableUnitedStatesTreasurySecurity
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyThirteenDueMarchTwentyEighteenMember		  
2013 Senior Notes due March 2023        
Debt Instrument [Line Items]        
Principal of debt instrument     250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyThirteenDueMarchTwentyTwentyThreeMember		  
Debt instrument maturity date     Mar. 15, 2023  
Issuance date     2013-03  
Interest rate     3.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyThirteenDueMarchTwentyTwentyThreeMember		  
Interest terms     Interest on the 2013 Senior Notes is payable semi-annually on March 15 and September 15 of each year, beginning September 15, 2013.  
Redemption terms     Mattel may redeem all or part of the 3.15% Senior Notes at any time or from time to time prior to December 15, 2022 (three months prior to the maturity date of the 3.15% Senior Notes) at its option, at a redemption price equal to the greater of (i) 100% of the principal amount of the notes being redeemed plus accrued and unpaid interest to, but excluding, the redemption date, and (ii) a “make-whole” amount based on the yield of a comparable US Treasury security plus 20 basis points. Mattel may redeem all or part of the 3.15% Senior Notes at any time or from time to time on or after December 15, 2022 (three months prior to the maturity date for the 3.15% Senior Notes) at its option, at a redemption price equal to 100% of the principal amount of the notes to be redeemed plus accrued and unpaid interest to, but excluding, the redemption date.  
Redemption price option one     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyThirteenDueMarchTwentyTwentyThreeMember		  
Redemption price option two     0.20%mat_DebtRedemptionPriceBasisPointsAboveComparableUnitedStatesTreasurySecurity
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyThirteenDueMarchTwentyTwentyThreeMember		  
2010 Senior Notes        
Debt Instrument [Line Items]        
Interest rate 5.275%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyTenMember		     5.275%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyTenMember
Interest rate range - low end 4.35%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyTenMember		     4.35%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyTenMember
Interest rate range - high end 6.20%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyTenMember		     6.20%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyTenMember
2011 Senior Notes        
Debt Instrument [Line Items]        
Interest rate 3.975%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyElevenMember		     3.975%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyElevenMember
Interest rate range - low end 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyElevenMember		     2.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyElevenMember
Interest rate range - high end 5.45%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyElevenMember		     5.45%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyElevenMember
2013 Senior Notes        
Debt Instrument [Line Items]        
Interest rate 2.425%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyThirteenMember		     2.425%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyThirteenMember
Interest rate range - low end 1.70%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyThirteenMember		     1.70%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyThirteenMember
Interest rate range - high end 3.15%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyThirteenMember		     3.15%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyThirteenMember
2014 Senior Notes        
Debt Instrument [Line Items]        
Interest rate       2.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyFourteenMember
2008 Senior Notes        
Debt Instrument [Line Items]        
Repayment of senior notes 350,000,000us-gaap_RepaymentsOfSeniorDebt
/ us-gaap_LongtermDebtTypeAxis
= mat_SeniorNotesTwentyZeroEightMember		      
MEGA Brands        
Debt Instrument [Line Items]        
Repayment of long-term borrowings assumed       44,600,000us-gaap_RepaymentsOfAssumedDebt
/ us-gaap_BusinessAcquisitionAxis
= mat_MegaBrandsMember
2013 Credit Facility        
Debt Instrument [Line Items]        
Terms of credit facility       The agreement governing the credit facility was amended and restated on March 11, 2013 to, among other things, (i) extend the maturity date of the credit facility to March 12, 2018, (ii) increase aggregate commitments under the credit facility to $1.60 billion, with an “accordion feature,” which allows Mattel to increase the aggregate availability under the credit facility to $1.85 billion under certain circumstances, (iii) decrease the applicable interest rate margins to a range of 0.00% to 0.75% above the applicable base rate for base rate loans and 0.88% to 1.75% above the applicable LIBOR for Eurodollar rate loans, in each case depending on Mattel’s senior unsecured long-term debt rating, and (iv) decrease commitment fees to a range of 0.08% to 0.28% of the unused commitments under the credit facility.
Maturity date       Mar. 12, 2018
Aggregate commitment under the credit facility       1,600,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= mat_CreditFacilityTwentyThirteenMember
Aggregate commitment under the credit facility, including the accordion feature       1,850,000,000mat_LineOfCreditFacilityMaximumBorrowingCapacityAccordionFeature
/ us-gaap_DebtInstrumentAxis
= mat_CreditFacilityTwentyThirteenMember
2013 Credit Facility | Minimum        
Debt Instrument [Line Items]        
Commitment fee rate for unused commitments       0.08%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_DebtInstrumentAxis
= mat_CreditFacilityTwentyThirteenMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
2013 Credit Facility | Maximum        
Debt Instrument [Line Items]        
Commitment fee rate for unused commitments       0.28%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_DebtInstrumentAxis
= mat_CreditFacilityTwentyThirteenMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
2013 Credit Facility | Base Rate | Minimum        
Debt Instrument [Line Items]        
Interest rate margin for loans       0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= mat_CreditFacilityTwentyThirteenMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
2013 Credit Facility | Base Rate | Maximum        
Debt Instrument [Line Items]        
Interest rate margin for loans       0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= mat_CreditFacilityTwentyThirteenMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
2013 Credit Facility | LIBOR | Minimum        
Debt Instrument [Line Items]        
Interest rate margin for loans       0.88%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= mat_CreditFacilityTwentyThirteenMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
2013 Credit Facility | LIBOR | Maximum        
Debt Instrument [Line Items]        
Interest rate margin for loans       1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= mat_CreditFacilityTwentyThirteenMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
2011 Credit Facility        
Debt Instrument [Line Items]        
Aggregate commitment under the credit facility       1,400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= mat_CreditFacilityTwentyElevenMember
Foreign Short Term Bank Loans        
Debt Instrument [Line Items]        
Short term bank loans outstanding 4,300,000us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= mat_ForeignShortTermBankLoansMember		     0us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= mat_ForeignShortTermBankLoansMember
Average borrowings 38,000,000us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= mat_ForeignShortTermBankLoansMember		     17,500,000us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= mat_ForeignShortTermBankLoansMember
Weighted average interest rate as of the balance sheet date 9.40%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= mat_ForeignShortTermBankLoansMember		     11.20%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= mat_ForeignShortTermBankLoansMember
Domestic Unsecured Committed Revolving Credit Facility And Other Short Term Borrowings        
Debt Instrument [Line Items]        
Average borrowings $ 262,300,000us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= mat_DomesticUnsecuredCommittedRevolvingCreditFacilityAndOtherShortTermBorrowingsMember		     680,800,000us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= mat_DomesticUnsecuredCommittedRevolvingCreditFacilityAndOtherShortTermBorrowingsMember
Weighted average interest rate as of the balance sheet date 0.20%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= mat_DomesticUnsecuredCommittedRevolvingCreditFacilityAndOtherShortTermBorrowingsMember		     0.20%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= mat_DomesticUnsecuredCommittedRevolvingCreditFacilityAndOtherShortTermBorrowingsMember