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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	$ 1,392,925us-gaap_Goodwill	$ 1,084,118us-gaap_Goodwill
Currency Exchange Rate Impact	(7,030)us-gaap_GoodwillTranslationAdjustments
Goodwill, ending balance	1,385,895us-gaap_Goodwill	1,084,118us-gaap_Goodwill
North America
Goodwill [Line Items]
Goodwill, beginning balance	720,939us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mat_NorthAmericaSegmentMember
Currency Exchange Rate Impact	(1,751)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = mat_NorthAmericaSegmentMember
Goodwill, ending balance	719,188us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mat_NorthAmericaSegmentMember
International
Goodwill [Line Items]
Goodwill, beginning balance	458,766us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mat_InternationalMember
Currency Exchange Rate Impact	(4,640)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = mat_InternationalMember
Goodwill, ending balance	454,126us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mat_InternationalMember
American Girl
Goodwill [Line Items]
Goodwill, beginning balance	213,220us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mat_AmericanGirlMember
Currency Exchange Rate Impact	(639)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = mat_AmericanGirlMember
Goodwill, ending balance	$ 212,581us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mat_AmericanGirlMember

X

- Definition

Amount after accumulated impairment loss 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

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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- Details

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X

- 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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X

- Details

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X

- Details

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