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Employee Benefit Plans - Narrative (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 USD ($) incentive_program | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) incentive_program | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other selling and administrative expenses | $ (418,414) | $ (365,961) | $ (308,311) | $ (297,336) | $ (398,253) | $ (325,874) | $ (360,000) | $ (424,617) | $ (1,390,022) | $ (1,508,744) | $ (1,517,983)
Accumulated benefit obligation of defined benefit pension plans | 608,400 |  |  |  | 549,700 |  |  |  | 608,400 | 549,700 |
Total estimated cash contributions to be made during the next fiscal year for defined benefit pension and postretirement benefit plans | $ 11,000 |  |  |  |  |  |  |  | $ 11,000 |  |
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%
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 | $ 65,200 |  |  |  | 68,300 |  |  |  | $ 65,200 | 68,300 |
Cash surrender value of life insurance policies | $ 75,700 |  |  |  | $ 65,800 |  |  |  | 75,700 | 65,800 |
Expense for incentive compensation plans |  |  |  |  |  |  |  |  | $ 119,500 | 84,100 | $ 19,400
Number of long-term incentive programs | incentive_program | 3 |  |  |  |  |  |  |  | 3 |  |
Long-term Incentive Program |  |  |  |  |  |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long term incentive compensation expenses |  |  |  |  |  |  |  |  | $ 11,000 | $ 3,000 | $ 600
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 | $ 8,500 |  |  |  |  |  |  |  | $ 8,500 |  |
Long-term rate of return on plan assets used to determine net periodic benefit cost for domestic defined benefit pension plans |  |  |  |  |  |  |  |  | 6.00% | 6.00% | 6.30%
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 | $ (2,100) |  |  |  |  |  |  |  | $ (2,100) |  |
Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other selling and administrative expenses |  |  |  |  |  |  |  |  |  |  | $ 3,400

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