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Net Sales to Three Largest Customers (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 1,993,966 us-gaap_SalesRevenueNet | $ 2,021,424 us-gaap_SalesRevenueNet | $ 1,062,252 us-gaap_SalesRevenueNet | $ 946,177 us-gaap_SalesRevenueNet | $ 2,113,216 us-gaap_SalesRevenueNet | $ 2,206,961 us-gaap_SalesRevenueNet | $ 1,169,109 us-gaap_SalesRevenueNet | $ 995,606 us-gaap_SalesRevenueNet | $ 6,023,819 us-gaap_SalesRevenueNet | $ 6,484,892 us-gaap_SalesRevenueNet | $ 6,420,881 us-gaap_SalesRevenueNet
Wal-Mart |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 1,100,000 us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = mat_WalMartMember | 1,200,000 us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = mat_WalMartMember | 1,200,000 us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = mat_WalMartMember
Toys "R" Us |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 600,000 us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = mat_ToysRUsMember | 700,000 us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = mat_ToysRUsMember | 700,000 us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = mat_ToysRUsMember
Target |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | $ 500,000 us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = mat_TargetMember | $ 500,000 us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = mat_TargetMember | $ 500,000 us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = mat_TargetMember

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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