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Employee Benefit Plans - Narrative (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Employee Benefits Disclosure [Line Items]            
Percentage of total membership in pension plan insured     40.00%      
Accumulated benefit obligation of defined benefit pension plans     $ 618,500,000 $ 588,400,000    
Total estimated cash contributions to be made during the next fiscal year for defined benefit pension and postretirement benefit plans     $ 18,000,000      
Percentage of domestic defined benefit pension plan assets to total defined benefit pension plan assets     77.00%      
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     $ 76,600,000 70,000,000    
Cash surrender value of life insurance policies     67,900,000 70,900,000    
Expense for incentive compensation plans     $ 19,400,000 $ 16,500,000 $ 50,200,000  
January 1, 2014 to December 31, 2016 LTIP | Performance- Related Component            
Employee Benefits Disclosure [Line Items]            
Performance cycle     3 years      
Weighted average grant date fair value of restricted stock units granted (in USD per share)       $ 32.60 $ 23.14 $ 39.03
Expense recognized for restricted stock units     $ 0      
January 1, 2014 to December 31, 2016 LTIP | Market- Related Component            
Employee Benefits Disclosure [Line Items]            
Weighted average grant date fair value of restricted stock units granted (in USD per share)       $ (3.57) $ (3.57) $ (3.57)
January 1, 2015 to December 31, 2017 LTIP            
Employee Benefits Disclosure [Line Items]            
Number of shares earned for performance related component of performance restricted stock units     0      
Number of shares earned for market related component of performance restricted stock units     0      
Number of shares earned for dividend equivalent rights component of performance restricted stock units     0      
January 1, 2015 to December 31, 2017 LTIP | Performance- Related Component            
Employee Benefits Disclosure [Line Items]            
Expense recognized for restricted stock units       $ 0 $ 0  
January 1, 2015 to December 31, 2017 LTIP | Market- Related Component            
Employee Benefits Disclosure [Line Items]            
Expense recognized for restricted stock units       0 $ 0  
January 1, 2016 to December 31, 2018 LTIP            
Employee Benefits Disclosure [Line Items]            
Number of shares that can be earned for each of the three years for the performance-related component of performance restricted stock units - range of possible outcomes - (low-end) (in shares)     0      
Number of shares that can be earned for each of the three years for the performance-related component of performance restricted stock units - range of possible outcomes - (high-end) (in shares)     400,000      
Adjustment (for the market-related component) to the results of the performance-related component of performance restricted stock units over the three-year performance cycle - range of possible outcomes - upward adjustment - (high-end) (in shares)     200,000      
Adjustment (for the market-related component) to the results of the performance-related component of performance restricted stock units over the three-year performance cycle - range of possible outcomes - downward adjustment - (low-end) (in shares)     200,000      
January 1, 2016 to December 31, 2018 LTIP | Performance- Related Component            
Employee Benefits Disclosure [Line Items]            
Performance cycle     3 years      
Weighted average grant date fair value of restricted stock units granted (in USD per share)     $ 32.60      
Expense recognized for restricted stock units       2,800,000    
Cumulative EPS Target, Term     3 years      
January 1, 2016 to December 31, 2018 LTIP | Market- Related Component            
Employee Benefits Disclosure [Line Items]            
Weighted average grant date fair value of restricted stock units granted (in USD per share)     $ 5.10      
Expense recognized for restricted stock units     $ 400,000 $ 400,000    
January 1, 2017 to December 31, 2019 LTIP            
Employee Benefits Disclosure [Line Items]            
Number of shares that can be earned for each of the three years for the performance-related component of performance restricted stock units - range of possible outcomes - (low-end) (in shares)     0      
Number of shares that can be earned for each of the three years for the performance-related component of performance restricted stock units - range of possible outcomes - (high-end) (in shares)     400,000      
Adjustment (for the market-related component) to the results of the performance-related component of performance restricted stock units over the three-year performance cycle - range of possible outcomes - upward adjustment - (high-end) (in shares)     200,000      
Adjustment (for the market-related component) to the results of the performance-related component of performance restricted stock units over the three-year performance cycle - range of possible outcomes - downward adjustment - (low-end) (in shares)     200,000      
January 1, 2017 to December 31, 2019 LTIP | Performance- Related Component            
Employee Benefits Disclosure [Line Items]            
Weighted average grant date fair value of restricted stock units granted (in USD per share)     $ 21.60      
Expense recognized for restricted stock units     $ 0      
January 1, 2017 to December 31, 2019 LTIP | Market- Related Component            
Employee Benefits Disclosure [Line Items]            
Weighted average grant date fair value of restricted stock units granted (in USD per share)     $ 1.46      
January 1, 2017 to December 31, 2019 LTIP | Performance Shares Market Related Component [Member]            
Employee Benefits Disclosure [Line Items]            
Expense recognized for restricted stock units     $ 200,000      
U.S. equity securities            
Employee Benefits Disclosure [Line Items]            
Target allocation for domestic defined benefit pension plan assets     42.00%      
Non US 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%      
Postretirement benefit plans            
Employee Benefits Disclosure [Line Items]            
Estimated net actuarial loss and prior service credit that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in next fiscal year     $ 8,500,000      
Long-term rate of return on plan assets used to determine net periodic benefit cost for domestic defined benefit pension plans 6.80% 7.50% 6.30% 6.50%    
Deferred compensation and excess benefit plans            
Employee Benefits Disclosure [Line Items]            
Estimated net actuarial loss and prior service credit that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in next fiscal year     $ 2,000,000      
Restatement Adjustment | January 1, 2016 to December 31, 2018 LTIP | Performance- Related Component            
Employee Benefits Disclosure [Line Items]            
Expense recognized for restricted stock units     $ (2,800,000)