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Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Goodwill, beginning balance $ 1,083,239us-gaap_Goodwill $ 1,080,798us-gaap_Goodwill
Acquisition 320,330us-gaap_GoodwillAcquiredDuringPeriod  
Currency exchange rate impact (9,601)us-gaap_GoodwillTranslationAdjustments 2,441us-gaap_GoodwillTranslationAdjustments
Goodwill, ending balance 1,393,968us-gaap_Goodwill 1,083,239us-gaap_Goodwill
North America    
Goodwill [Line Items]    
Goodwill, beginning balance 547,595us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mat_NorthAmericaSegmentMember
546,898us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mat_NorthAmericaSegmentMember
Acquisition 176,182us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= mat_NorthAmericaSegmentMember
 
Currency exchange rate impact (2,264)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= mat_NorthAmericaSegmentMember
697us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= mat_NorthAmericaSegmentMember
Goodwill, ending balance 721,513us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mat_NorthAmericaSegmentMember
547,595us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mat_NorthAmericaSegmentMember
International    
Goodwill [Line Items]    
Goodwill, beginning balance 321,656us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mat_InternationalMember
320,169us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mat_InternationalMember
Acquisition 144,148us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= mat_InternationalMember
 
Currency exchange rate impact (6,569)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= mat_InternationalMember
1,487us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= mat_InternationalMember
Goodwill, ending balance 459,235us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mat_InternationalMember
321,656us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mat_InternationalMember
American Girl    
Goodwill [Line Items]    
Goodwill, beginning balance 213,988us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mat_AmericanGirlMember
213,731us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mat_AmericanGirlMember
Currency exchange rate impact (768)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= mat_AmericanGirlMember
257us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= mat_AmericanGirlMember
Goodwill, ending balance $ 213,220us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mat_AmericanGirlMember
$ 213,988us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mat_AmericanGirlMember