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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) |  |  |

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