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Segment Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Accounts receivable and inventories, net | $ 1,655,227 mat_AccountsReceivableAndInventoriesNet | $ 1,828,948 mat_AccountsReceivableAndInventoriesNet | $ 1,691,890 mat_AccountsReceivableAndInventoriesNet
Operating Segments |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Accounts receivable and inventories, net | 1,584,893 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,745,094 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,592,725 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating Segments | North America |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Accounts receivable and inventories, net | 697,377 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mat_NorthAmericaSegmentMember | 723,886 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mat_NorthAmericaSegmentMember | 694,479 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 | 778,849 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mat_InternationalMember | 920,770 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mat_InternationalMember | 807,911 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 | 108,667 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mat_AmericanGirlMember | 100,438 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mat_AmericanGirlMember | 90,335 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 | $ 70,334 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | $ 83,854 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | $ 99,165 mat_AccountsReceivableAndInventoriesNet / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember

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