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