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Share-Based Payments - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) Age $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation | $ | $ 55,968,000 | $ 48,915,000 | $ 67,119,000 |
Total unrecognized compensation cost related to unvested share-based payments | $ | $ 81,400,000 |  |  |
Weighted average period for unrecognized compensation cost expected to be recognized | 1 year 10 months 24 days |  |  |
Weighted average grant date fair value of stock options granted (USD per share) | $ / shares | $ 5.09 | $ 5.46 | $ 3.37 |
Intrinsic value of stock options exercised | $ |  |  | $ 500,000 |
Intrinsic value of stock options outstanding | $ | $ 0 |  |  |
Weighted average remaining life of stock options outstanding | 5 years 2 months 12 days |  |  |
Weighted average remaining life of stock options exercisable | 4 years |  |  |
Cash received for stock option exercises | $ | $ 0 | $ 0 | 1,775,000 |
Stock options vested or expected to vest (in shares) | 21,800,000 |  |  |
Intrinsic value of stock options vested or expected to vest | $ | $ 200,000 |  |  |
Weighted average exercise price of stock options vested or expected to vest (USD per share) | $ / shares | $ 24.52 |  |  |
Weighted average remaining life of stock options vested or expected to vest | 5 years 1 month 6 days |  |  |
Approximate stock options vested (in shares) | 2,000,000 |  |  |
Approximate total grant date fair value of stock options vested | $ | $ 8,000,000 | 12,000,000 | 14,000,000 |
Weighted average grant date fair value of restricted stock units expected to vest (USD per share) | $ / shares | $ 15.25 |  |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation | $ | $ 11,300,000 | 8,400,000 | 14,100,000 |
Income tax benefits (expense) from share-based payment arrangements | $ | $ 0 | 0 | 0 |
Stock Options | Grants prior to March 1, 2019 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued per RSU award (in shares) | 1 |  |  |
Stock Options | Grants on or after March 1, 2019 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued per RSU award (in shares) | 1 |  |  |
Market-Based Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Cycle | 3 years |  |  |
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
General vesting period | 3 years |  |  |
Number of shares issued per RSU award (in shares) | 3 |  |  |
Restricted stock units expected to vest (in shares) | 3,400,000 |  |  |
Total grant date fair value of restricted stock units vested | $ | $ 36,000,000.0 | 43,200,000 | 57,000,000.0 |
Restricted Stock Units (RSUs) | Grants prior to March 1, 2019 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued per RSU award (in shares) | 3 |  |  |
Restricted Stock Units (RSUs) | Grants on or after March 1, 2019 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued per RSU award (in shares) | 0.7 |  |  |
RSUs, Excluding Performance RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation | $ | $ 33,600,000 | 37,500,000 | 55,200,000 |
Income tax benefits (expense) from share-based payment arrangements | $ | $ 0 | $ 0 | $ 0 |
Restricted stock units expected to vest (in shares) | 3,864,000 | 4,721,000 | 4,898,000 | 3,243,000
Performance RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Income tax benefits (expense) from share-based payment arrangements | $ | $ 0 | $ 0 | $ 0 |
Stock Appreciation Rights (SARs) | Grants prior to March 1, 2019 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued per RSU award (in shares) | 1 |  |  |
Stock Appreciation Rights (SARs) | Grants on or after March 1, 2019 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued per RSU award (in shares) | 1 |  |  |
Restricted Stock | Grants prior to March 1, 2019 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued per RSU award (in shares) | 3 |  |  |
Restricted Stock | Grants on or after March 1, 2019 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued per RSU award (in shares) | 2 |  |  |
Amended 2010 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized | 104,000,000 |  |  |
Remaining number of shares of common stock available for grant under the Mattel, Inc. 2010 Equity and Long-Term Compensation Plan | 24,000,000 |  |  |
Weighted average grant date fair value of stock options granted (USD per share) | $ / shares |  | $ 4.21 |  |
Amended 2010 Plan | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Minimum grant date fair value of nonqualified stock options as a percentage of the fair value of Mattel's common stock | 100.00% |  |  |
General vesting period | 3 years |  |  |
Age requirement for accelerated vesting | Age | 55 |  |  |
Service period requirement for accelerated vesting | 5 years |  |  |
Accelerated vesting period for individuals who meet the age and service requirements | 6 months |  |  |
Amended 2010 Plan | Stock Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option expire from date of grant, period (no later than) | 10 years |  |  |
Amended 2010 Plan | Market-Based Options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Remaining number of shares of common stock available for grant under the Mattel, Inc. 2010 Equity and Long-Term Compensation Plan |  | 0 |  |
Amended 2010 Plan | Market-Based Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Remaining number of shares of common stock available for grant under the Mattel, Inc. 2010 Equity and Long-Term Compensation Plan |  | 1,300,000 |  |
Amended 2010 Plan | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
General vesting period | 3 years |  |  |
Age requirement for accelerated vesting | Age | 55 |  |  |
Service period requirement for accelerated vesting | 5 years |  |  |
Accelerated vesting period for individuals who meet the age and service requirements | 6 months |  |  |

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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |