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Employee Benefit Plans - Narrative (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense, net |  |  |  |  |  | $ 1,910,000 |  |  | $ 7,532,000 | $ 7,331,000 | $ 68,110,000 | $ 31,959,000
Other selling and administrative expenses | $ (398,253,000) | $ (325,874,000) | $ (360,000,000) | $ (424,617,000) | $ (452,644,000) | (381,214,000) | $ (353,296,000) | $ (330,829,000) | (1,065,339,000) | (1,508,744,000) | (1,517,983,000) | (1,391,769,000)
Accumulated benefit obligation of defined benefit pension plans | 549,700,000 |  |  |  | $ 618,500,000 |  |  |  |  | 549,700,000 | $ 618,500,000 |
Total estimated cash contributions to be made during the next fiscal year for defined benefit pension and postretirement benefit plans | $ 6,000,000 |  |  |  |  |  |  |  |  | $ 6,000,000 |  |
Percentage of domestic defined benefit pension plan assets to total defined benefit pension plan assets | 77.00% |  |  |  |  |  |  |  |  | 77.00% |  |
Percentage of total membership in pension plan insured |  |  |  |  | 40.00% |  |  |  |  |  | 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% |  |  |  |  |  |  |  |  | 25.00% |  |
Liability for deferred compensation and excess benefit plans | $ 68,300,000 |  |  |  | $ 76,600,000 |  |  |  |  | $ 68,300,000 | $ 76,600,000 |
Cash surrender value of life insurance policies | $ 65,800,000 |  |  |  | 67,900,000 |  |  |  |  | 65,800,000 | 67,900,000 |
Expense for incentive compensation plans |  |  |  |  |  |  |  |  |  | $ 84,100,000 | 19,400,000 | 16,500,000
January 1, 2016 to December 31, 2018 LTIP | Performance-Related Component |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Performance cycle |  |  |  |  |  |  |  |  |  | 3 years |  |
Number Of Shares Earned For Performance Related Component Of Performance Restricted Stock Units |  |  |  |  |  |  |  |  |  | 0 |  |
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 |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  | $ 0 | $ 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) |  |  |  |  |  |  |  |  |  | 100,000.0 |  |
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) |  |  |  |  |  |  |  |  |  | 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 - upward adjustment - (high-end) (in shares) |  |  |  |  |  |  |  |  |  | 100,000 |  |
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) |  |  |  |  |  |  |  |  |  | 100,000 |  |
January 1, 2017 to December 31, 2019 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) |  |  |  |  |  |  |  |  |  | $ 13.24 | $ 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 | $ 1.46 |
Expense recognized for restricted stock units |  |  |  |  |  |  |  |  |  | $ 300,000 | $ 0 |
January 1, 2017 to December 31, 2019 LTIP | Performance Shares Market Related Component |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expense recognized for restricted stock units |  |  |  |  |  |  |  |  |  | $ 200,000 |  |
January 1, 2018 to December 31, 2020 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) |  |  |  |  |  |  |  |  |  | 1,700,000 |  |
January 1, 2018 to December 31, 2020 LTIP | Performance-Related Component |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value of restricted stock units granted (in USD per share) |  |  |  |  |  |  |  |  |  | $ 15.08 |  |
January 1, 2018 to December 31, 2020 LTIP | Performance Shares Market Related Component |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expense recognized for restricted stock units |  |  |  |  |  |  |  |  |  | $ 2,700,000 |  |
U.S. equity securities |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Target allocation for domestic defined benefit pension plan assets | 42.00% |  |  |  |  |  |  |  |  | 42.00% |  |
Non US Equity Securities |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Target allocation for domestic defined benefit pension plan assets | 28.00% |  |  |  |  |  |  |  |  | 28.00% |  |
Long-Term Bond Securities |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Target allocation for domestic defined benefit pension plan assets | 20.00% |  |  |  |  |  |  |  |  | 20.00% |  |
US Treasury Securities |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Target allocation for domestic defined benefit pension plan assets | 10.00% |  |  |  |  |  |  |  |  | 10.00% |  |
Defined benefit pension plans |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated net actuarial loss (gain) and prior service credit that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in next fiscal year | $ 6,300,000 |  |  |  |  |  |  |  |  | $ 6,300,000 |  |
Long-term rate of return on plan assets used to determine net periodic benefit cost for domestic defined benefit pension plans |  |  |  |  |  |  |  |  |  | 6.00% | 6.30% | 6.50%
Postretirement benefit plans |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated net actuarial loss (gain) and prior service credit that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in next fiscal year | (2,400,000) |  |  |  |  |  |  |  |  | $ (2,400,000) |  |
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense, net |  |  |  |  |  | 0 |  |  | 0 | 0 | $ 0 | $ 0
Other selling and administrative expenses | $ (3,948,000) |  | $ 0 |  | 0 | 0 | 0 | 0 | $ 0 | (3,948,000) | 0 | 0
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) |  |
Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense, net |  |  |  |  | 1,800,000 | 500,000 | (300,000) | 1,400,000 |  |  | 3,400,000 | 8,400,000
Other selling and administrative expenses |  |  |  |  | $ 1,800,000 | $ 500,000 | $ (300,000) | $ 1,400,000 |  |  | $ 3,400,000 | $ 8,400,000

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