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Goodwill (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014
Goodwill [Line Items] |  |
Goodwill, beginning balance | $ 1,392,925 us-gaap_Goodwill | $ 1,084,118 us-gaap_Goodwill
Currency Exchange Rate Impact | (7,030)us-gaap_GoodwillTranslationAdjustments |
Goodwill, ending balance | 1,385,895 us-gaap_Goodwill | 1,084,118 us-gaap_Goodwill
North America |  |
Goodwill [Line Items] |  |
Goodwill, beginning balance | 720,939 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mat_NorthAmericaSegmentMember |
Currency Exchange Rate Impact | (1,751)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = mat_NorthAmericaSegmentMember |
Goodwill, ending balance | 719,188 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mat_NorthAmericaSegmentMember |
International |  |
Goodwill [Line Items] |  |
Goodwill, beginning balance | 458,766 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mat_InternationalMember |
Currency Exchange Rate Impact | (4,640)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = mat_InternationalMember |
Goodwill, ending balance | 454,126 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mat_InternationalMember |
American Girl |  |
Goodwill [Line Items] |  |
Goodwill, beginning balance | 213,220 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mat_AmericanGirlMember |
Currency Exchange Rate Impact | (639)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = mat_AmericanGirlMember |
Goodwill, ending balance | $ 212,581 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mat_AmericanGirlMember |

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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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