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Deferred Income Tax Assets (Liabilities) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Tax credit carryforwards | $ 54,674 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther | $ 77,396 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther
Research and development expenses | 189,694 mat_DeferredTaxAssetsResearchAndDevelopment | 187,477 mat_DeferredTaxAssetsResearchAndDevelopment
Loss carryforwards | 172,347 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 124,201 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Allowances and reserves | 233,434 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 202,141 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Deferred compensation | 91,530 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther | 111,850 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
Postretirement benefits | 50,235 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits | 37,479 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Intangible assets | 30,803 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets |
Other | 68,604 us-gaap_DeferredTaxAssetsOther | 66,599 us-gaap_DeferredTaxAssetsOther
Gross deferred income tax assets | 891,321 us-gaap_DeferredTaxAssetsGross | 807,143 us-gaap_DeferredTaxAssetsGross
Intangible assets | (298,444)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets | (282,737)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Other | (3,868)us-gaap_DeferredTaxLiabilitiesOther | (5,555)us-gaap_DeferredTaxLiabilitiesOther
Gross deferred income tax liabilities | (302,312)us-gaap_DeferredIncomeTaxLiabilities | (288,292)us-gaap_DeferredIncomeTaxLiabilities
Deferred income tax asset valuation allowances | (133,297)us-gaap_DeferredTaxAssetsValuationAllowance | (64,641)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred income tax assets | $ 455,712 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 454,210 us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition The tax effect as of the balance sheet date of the amount of future tax deductions arising from research expenditures capitalized for taxes. + References No definition available. + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to other deductible tax credit carryforwards not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other compensation and benefits not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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