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Employee Benefit Plans - Additional Information (Detail) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Employee Benefits Disclosure [Line Items] |  |  |  |  |
Accumulated benefit obligation of defined benefit pension plans | $ 589,200,000 |  | $ 588,400,000 | $ 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 |  |  | 2,100,000 |  |
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 |  |  | (1,900,000) |  |
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 |  |  | 10,000,000 |  |
Total estimated cash contributions to be made during the next fiscal year for unfunded defined benefit pension and postretirement benefit plans |  |  | $ 9,000,000 |  |
Percentage of domestic defined benefit pension plan assets to total defined benefit pension plan assets |  |  | 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% |  |
Liability for deferred compensation and excess benefit plans | 71,700,000 |  | $ 70,000,000 | 71,700,000 |
Cash surrender value of life insurance policies | $ 67,300,000 |  | 70,900,000 | 67,300,000 |
Expense for incentive compensation plans |  |  | $ 16,500,000 | $ 50,200,000 | $ 25,200,000
January 1, 2014 to December 31, 2016 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, 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 | $ 0 | $ 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)
Expense recognized for restricted stock units |  |  | $ 0 | $ 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) |  |  | 500,000 |  |
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 |  |
US corporate debt instruments |  |  |  |  |
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% |  |
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 |  |  | $ 6,500,000 |  |
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% | 6.50% |  | 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 |  |  | $ 200,000 |  |

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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