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

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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). 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 FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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