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Employee Benefit Plans - Narrative (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee Benefits Disclosure [Line Items]        
Accumulated benefit obligation of defined benefit pension plans $ 652.7 $ 608.4    
Total estimated cash contributions to be made during the next fiscal year for defined benefit pension and postretirement benefit plans $ 17.0      
Percentage of domestic defined benefit pension plan assets to total defined benefit pension plan assets 76.00%      
Percentage of total membership in pension plan insured       40.00%
Percentage limitation of an employee's total account balance that may be allocated to the Mattel Stock Fund in the Mattel, Inc. Personal Investment Plan 25.00%      
Liability for deferred compensation and excess benefit plans $ 59.9 65.2    
Cash surrender value of life insurance policies 79.9 75.7    
Expense for incentive compensation plans $ 122.5 $ 119.5 $ 84.1  
U.S. equity securities        
Employee Benefits Disclosure [Line Items]        
Target allocation for domestic defined benefit pension plan assets 42.00%      
Non U.S. Equity Securities        
Employee Benefits Disclosure [Line Items]        
Target allocation for domestic defined benefit pension plan assets 28.00%      
Long-Term Bond Securities        
Employee Benefits Disclosure [Line Items]        
Target allocation for domestic defined benefit pension plan assets 20.00%      
US Treasury Securities        
Employee Benefits Disclosure [Line Items]        
Target allocation for domestic defined benefit pension plan assets 10.00%      
Defined benefit pension plans        
Employee Benefits Disclosure [Line Items]        
Long-term rate of return on plan assets used to determine net periodic benefit cost for domestic defined benefit pension plans 5.50% 6.00% 6.00%