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Employee Benefit Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions
 6 Months Ended 12 Months Ended 24 Months Ended 36 Months Ended
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2013
Employee Benefits Disclosure [Line Items]              
Accumulated benefit obligation of defined benefit pension plans $ 589,200,000   $ 589,200,000 $ 632,200,000   $ 589,200,000  
The impact to postretirement benefit plan obligation from a one percentage point increase in the assumed health care cost trend rate for each future year     2,000,000        
The impact to postretirement benefit plan obligation from a one percentage point decrease in the assumed health care cost trend rate for each future year     (1,600,000)        
The impact to postretirement benefit plan service and interest cost from a one percentage point increase in the assumed health care cost trend rate for each future year     100,000        
The impact to postretirement benefit plan service and interest cost from a one percentage point decrease in the assumed health care cost trend rate for each future year     (100,000)        
Total estimated cash contributions to be made during the next fiscal year for defined benefit pension and postretirement benefit plans     12,000,000        
Total estimated cash contributions to be made during the next fiscal year for unfunded defined benefit pension and postretirement benefit plans     $ 11,000,000        
Percentage of domestic defined benefit pension plan assets to total defined benefit pension plan assets 79.00%   79.00%     79.00%  
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%   25.00%     25.00%  
Liability for deferred compensation and excess benefit plans $ 71,700,000   $ 71,700,000 73,600,000   $ 71,700,000  
Cash surrender value of life insurance policies $ 67,300,000   67,300,000 67,600,000   $ 67,300,000  
Expense for incentive compensation plans     $ 50,200,000 $ 25,200,000 $ 65,000,000    
January 1, 2011 to December 31, 2013 LTIP              
Employee Benefits Disclosure [Line Items]              
Performance cycle             3 years
Number of shares earned related to performance related component (in shares)             1.0
Number of shares earned related to market related component (in shares)             0.5
Number of shares earned related to dividend equivalent rights (in shares)             0.1
Number of shares earned related to performance and market related component (in shares)             1.6
January 1, 2011 to December 31, 2013 LTIP | Performance- Related Component              
Employee Benefits Disclosure [Line Items]              
Weighted average grant date fair value of restricted stock units granted (in USD per share)         $ 42.30    
Expense recognized for restricted stock units         $ 10,000,000    
January 1, 2011 to December 31, 2013 LTIP | Market- Related Component              
Employee Benefits Disclosure [Line Items]              
Weighted average grant date fair value of restricted stock units granted (in USD per share)         $ 4.59    
Expense recognized for restricted stock units         $ 1,400,000    
January 1, 2014 to December 31, 2016 LTIP              
Employee Benefits Disclosure [Line Items]              
Performance cycle           3 years  
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)           0.0  
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)           0.5  
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)           0.5  
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)           0.5  
January 1, 2014 to December 31, 2016 LTIP | Performance- Related Component              
Employee Benefits Disclosure [Line Items]              
Weighted average grant date fair value of restricted stock units granted (in USD per share)     $ 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)      
US 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%        
US 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]              
Estimated net actuarial loss and prior service credit that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2015     $ 9,300,000        
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%   8.00% 8.00%    
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 2015     $ 100,000