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Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Debt Instrument [Line Items]
Long-term debt	$ 2,100,000us-gaap_LongTermDebt	$ 2,100,000us-gaap_LongTermDebt	$ 1,600,000us-gaap_LongTermDebt
Less: current portion	0us-gaap_LongTermDebtCurrent	0us-gaap_LongTermDebtCurrent	0us-gaap_LongTermDebtCurrent
Total long-term debt	2,100,000us-gaap_LongTermDebtNoncurrent	2,100,000us-gaap_LongTermDebtNoncurrent	1,600,000us-gaap_LongTermDebtNoncurrent
2010 Senior Notes
Debt Instrument [Line Items]
Long-term debt	500,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mat_SeniorNotesTwentyTenMember	500,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mat_SeniorNotesTwentyTenMember	500,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mat_SeniorNotesTwentyTenMember
2011 Senior Notes
Debt Instrument [Line Items]
Long-term debt	600,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mat_SeniorNotesTwentyElevenMember	600,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mat_SeniorNotesTwentyElevenMember	600,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mat_SeniorNotesTwentyElevenMember
2013 Senior Notes
Debt Instrument [Line Items]
Long-term debt	500,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mat_SeniorNotesTwentyThirteenMember	500,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mat_SeniorNotesTwentyThirteenMember	500,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mat_SeniorNotesTwentyThirteenMember
2014 Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 500,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mat_SeniorNotesTwentyFourteenMember	$ 500,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mat_SeniorNotesTwentyFourteenMember

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



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

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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