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Segment Assets (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Accounts receivable and inventories, net | $ 1,340,023 mat_AccountsReceivableAndInventoriesNet | $ 1,656,207 mat_AccountsReceivableAndInventoriesNet | $ 1,413,389 mat_AccountsReceivableAndInventoriesNet
Operating Segments |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Accounts receivable and inventories, net | 1,209,066 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,585,873 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,308,595 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating Segments | North America |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Accounts receivable and inventories, net | 550,807 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mat_NorthAmericaSegmentMember | 698,357 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mat_NorthAmericaSegmentMember | 463,905 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mat_NorthAmericaSegmentMember
Operating Segments | International |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Accounts receivable and inventories, net | 552,981 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mat_InternationalMember | 778,849 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mat_InternationalMember | 734,024 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mat_InternationalMember
Operating Segments | American Girl |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Accounts receivable and inventories, net | 105,278 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mat_AmericanGirlMember | 108,667 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mat_AmericanGirlMember | 110,666 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mat_AmericanGirlMember
Corporate and Other |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Accounts receivable and inventories, net | $ 130,957 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | $ 70,334 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | $ 104,794 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember

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