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Contingencies - Additional Information (Detail) (USD $)
 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended
Dec. 23, 2013
Dec. 21, 2013
Jan. 24, 2013
Aug. 11, 2011
Aug. 31, 2011
Apr. 30, 2011
LegalMatter
Jan. 13, 2014
Jan. 31, 2010
Apr. 30, 1999
Mar. 31, 2015
Apr. 27, 2009
Jul. 17, 2008
Nov. 11, 2014
Jul. 26, 2013
MGA                            
Commitments and Contingencies Disclosure [Line Items]                            
Historical jury verdict                     $ 100,000,000mat_HistoricalJuryVerdict
/ mat_LitigationClaimNameAxis
= mat_MgaMember		 $ 100,000,000mat_HistoricalJuryVerdict
/ mat_LitigationClaimNameAxis
= mat_MgaMember		    
Claimed trade secrets           26mat_ClaimedTradeSecrets
/ mat_LitigationClaimNameAxis
= mat_MgaMember		                
Other claimed trade secrets           88mat_OtherClaimedTradeSecrets
/ mat_LitigationClaimNameAxis
= mat_MgaMember		                
Compensatory damages awarded by jury           88,500,000mat_CompensatoryDamagesAwardedByJury
/ mat_LitigationClaimNameAxis
= mat_MgaMember		                
Reduced compensatory damages awarded by court         85,000,000mat_ReducedCompensatoryDamagesAwardedByCourt
/ mat_LitigationClaimNameAxis
= mat_MgaMember		                  
Punitive damages awarded         85,000,000mat_PunitiveDamagesAwarded
/ mat_LitigationClaimNameAxis
= mat_MgaMember		                  
Attorney fees and costs awarded         140,000,000mat_AttorneyFeesAndCostsAwarded
/ mat_LitigationClaimNameAxis
= mat_MgaMember		                  
Compensatory damages, punitive damages, and attorney fees and costs awarded by court         310,000,000mat_CompensatoryDamagesPunitiveDamagesAndAttorneyFeesAndCostsAwardedByCourt
/ mat_LitigationClaimNameAxis
= mat_MgaMember		                  
Damages for alleged trade secret misappropriation appealed       170,000,000mat_DamagesForAllegedTradeSecretMisappropriationAppealed
/ mat_LitigationClaimNameAxis
= mat_MgaMember		                    
Attorney fees and costs appealed       140,000,000mat_AttorneyFeesAndCostsAppealed
/ mat_LitigationClaimNameAxis
= mat_MgaMember		                    
Amount of damages and attorney's fees and costs vacated by the appeals court     172,500,000mat_AmountOfDamagesAndAttorneyFeesAndCostsVacatedByAppealsCourt
/ mat_LitigationClaimNameAxis
= mat_MgaMember		                      
Litigation accrual     138,000,000us-gaap_LitigationReserveCurrent
/ mat_LitigationClaimNameAxis
= mat_MgaMember		                      
Payment of Judgment 138,000,000mat_PaymentOfJudgment
/ mat_LitigationClaimNameAxis
= mat_MgaMember		                          
Approximate amount of judgment finalized in the District Court, including interest   138,000,000mat_AmountOfJudgmentFiledByDistrictCourt
/ mat_LitigationClaimNameAxis
= mat_MgaMember		                        
Reasonably possible range of loss, minimum                   0us-gaap_LossContingencyRangeOfPossibleLossMinimum
/ mat_LitigationClaimNameAxis
= mat_MgaMember		        
Reasonably possible range of loss, maximum                   12,500,000us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ mat_LitigationClaimNameAxis
= mat_MgaMember		        
Reasonably possible range of pre-judgment interest, minimum                   0mat_PreJudgmentInterestRangeOfReasonablyPossibleLossMinimum
/ mat_LitigationClaimNameAxis
= mat_MgaMember		        
Reasonably possible range of pre-judgment interest, maximum                   10,000,000mat_PreJudgmentInterestRangeOfReasonablyPossibleLossMaximum
/ mat_LitigationClaimNameAxis
= mat_MgaMember		        
Accrued litigation liability                   0us-gaap_LitigationReserve
/ mat_LitigationClaimNameAxis
= mat_MgaMember		        
MGA | Minimum                            
Commitments and Contingencies Disclosure [Line Items]                            
Alleged trade secrets damages claimed             1,000,000,000mat_AllegedTradeSecretsDamagesClaimed
/ mat_LitigationClaimNameAxis
= mat_MgaMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		              
Yellowstone                            
Commitments and Contingencies Disclosure [Line Items]                            
Reasonably possible range of loss, minimum                   0us-gaap_LossContingencyRangeOfPossibleLossMinimum
/ mat_LitigationClaimNameAxis
= mat_YellowstoneMember		        
Reasonably possible range of loss, maximum                   14,000,000us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ mat_LitigationClaimNameAxis
= mat_YellowstoneMember		        
Alleged loss of profits                 1,000,000mat_AllegedLossOfProfits
/ mat_LitigationClaimNameAxis
= mat_YellowstoneMember		          
Unpaid accounts receivable                   4,000,000mat_UnpaidAccountsReceivables
/ mat_LitigationClaimNameAxis
= mat_YellowstoneMember		        
Alleged business investments                   3,000,000mat_AllegedBusinessInvestments
/ mat_LitigationClaimNameAxis
= mat_YellowstoneMember		        
Initial court appointed expert estimated loss of profits                   1,000,000mat_InitialCourtAppointedExpertEstimatedLossOfProfits
/ mat_LitigationClaimNameAxis
= mat_YellowstoneMember		        
Court awarded damages from counterclaim               4,000,000mat_CourtAwardedDamagesFromCounterclaim
/ mat_LitigationClaimNameAxis
= mat_YellowstoneMember		            
Damages awarded by Appeals Court including inflation and interest                         14,500,000mat_DamagesAwardedByAppealsCourtIncludingInflationAndInterest
/ mat_LitigationClaimNameAxis
= mat_YellowstoneMember		 17,000,000mat_DamagesAwardedByAppealsCourtIncludingInflationAndInterest
/ mat_LitigationClaimNameAxis
= mat_YellowstoneMember
Counterclaim Awarded By Appeals Court                         $ 7,500,000mat_CounterClaimAwardedByAppealsCourtIncludingInflation
/ mat_LitigationClaimNameAxis
= mat_YellowstoneMember		 $ 7,500,000mat_CounterClaimAwardedByAppealsCourtIncludingInflation
/ mat_LitigationClaimNameAxis
= mat_YellowstoneMember