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Long-Term Debt - Additional Information (Detail) (2014 Senior Notes due May 2019, USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	May 31, 2014	Mar. 31, 2015
2014 Senior Notes due May 2019
Debt Instrument [Line Items]
Principal of debt instrument	$ 500.0us-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

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- Definition

Debt Instrument, Issuance, Month and Year

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Debt redemption price - Percentage equal to the amount above the yield of a comparable US Treasury security, used to determine the redemption price.

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Description of a feature that permits the issuer of the debt to repay or convert it before the stated maturity date (early retirement date). The description may include such items as the call price, the period that the issuer can call the debt, including the earliest call date, and other significant terms of the call feature, which may include the debt holders' ability to convert the debt to equity if the call option is exercised and contingent events that trigger the issuer's ability to call the debt.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823



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Face (par) amount of debt instrument at time of issuance.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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-Publisher SEC

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-Number 210

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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