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Share-Based Payments - Narrative (Details) $ / shares in Units, $ in Thousands, shares in Millions |  | 12 Months Ended
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Sep. 30, 2024 shares | Dec. 31, 2024 USD ($) incentiveProgram $ / shares shares | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation |  | $ 79,429 | $ 83,334 | $ 69,072
Income tax benefits from share-based payment arrangements |  | 9,000 | $ 10,000 | $ 9,000
Total unrecognized compensation cost related to unvested share-based payments |  | $ 120,900 |  |
Weighted average period for unrecognized compensation cost expected to be recognized |  | 2 years 3 months 18 days |  |
Weighted average grant date fair value of stock options granted (USD per share) | $ / shares |  | $ 0 | $ 8.91 | $ 11.18
Intrinsic value of stock options exercised |  | $ 2,000 | $ 9,000 | $ 8,000
Intrinsic value of stock options outstanding |  | $ 18,000 |  |
Weighted average remaining life of stock options outstanding |  | 3 years 6 months |  |
Intrinsic value of stock options exercisable |  | $ 18,000 |  |
Weighted average remaining life of stock options exercisable |  | 3 years 3 months 18 days |  |
Cash received from stock options exercised |  | $ 6,345 | 26,742 | 27,750
Stock options vested or expected to vest (in shares) | shares |  | 11.0 |  |
Intrinsic value of stock options vested or expected to vest |  | $ 18,000 |  |
Weighted average exercise price of stock options vested or expected to vest (USD per share) | $ / shares |  | $ 19.69 |  |
Weighted average remaining life of stock options vested or expected to vest |  | 3 years 6 months |  |
Approximate stock options vested (in shares) | shares |  | 1.0 |  |
Approximate total grant date fair value of stock options vested |  | $ 6,000 | 9,000 | 9,000
Weighted average grant date fair value of restricted stock units expected to vest (USD per share) | $ / shares |  | $ 18.98 |  |
Number of long-term incentive programs | incentiveProgram |  | 4 |  |
Long-term incentive program, performance target duration |  | 3 years |  |
Retention Performance Grant, Stock Hurdle Price |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
General vesting period | 5 years |  |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation |  | $ 3,100 | 6,700 | 13,200
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
General vesting period |  | 3 years |  |
Share-based compensation |  | $ 55,200 | 48,500 | 37,700
Stock units expected to vest (in shares) | shares |  | 5.0 |  |
Total grant date fair value of restricted stock units vested |  | $ 49,000 | $ 42,000 | $ 29,000
Weighted average grant date fair value (USD per share) | $ / shares |  | $ 18.50 | $ 18.24 | $ 23.20
Performance Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation |  | $ 21,200 | $ 28,100 | $ 18,200
Stock units expected to vest (in shares) | shares |  | 2.0 |  |
Weighted average grant date fair value of restricted stock units expected to vest (USD per share) | $ / shares |  | $ 21.10 |  |
Total grant date fair value of restricted stock units vested |  | $ 18,000 | $ 26,000 | $ 27,000
Long-term incentive program, performance target duration |  | 3 years |  |
Weighted average grant date fair value (USD per share) | $ / shares |  | $ 21.97 | $ 19.44 | $ 28.39
Performance Awards | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long-term incentive program, percentage of shares that may ultimately be earned |  | 200.00% |  |
Performance Awards | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long-term incentive program, percentage of shares that may ultimately be earned |  | 0.00% |  |
Retention Performance Grant |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
General vesting period | 5 years |  |  |
Remaining number of shares of common stock available for grant under the Mattel, Inc. 2010 Equity and Long-Term Compensation Plan (in shares) | shares | 0.8 |  |  |
Long-term incentive program, percentage of shares that may ultimately be earned | 100.00% |  |  |
Target value |  | $ 15,000 |  |
Retention Performance Grant | Retention Performance Grant, Stock Hurdle Price |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
General vesting period | 3 years |  |  |
Long-term incentive program, percentage of shares that may ultimately be earned | 50.00% |  |  |
Retention Performance Grant | Retention Performance Grant, TSR |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
General vesting period | 5 years |  |  |
Long-term incentive program, percentage of shares that may ultimately be earned | 50.00% |  |  |
Retention Performance Grant | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long-term incentive program, percentage of shares that may ultimately be earned | 200.00% |  |  |
Amended 2010 Plan | Prior To April 28, 2023 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Age requirement for accelerated vesting |  | 55 |  |
Service period requirement for accelerated vesting |  | 5 years |  |
Amended 2010 Plan | On Or After April 28, 2023 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Age requirement for accelerated vesting |  | 55 |  |
Service period requirement for accelerated vesting |  | 10 years |  |
Amended 2010 Plan | Target Performance Goals |  |  |  |
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 (in shares) | shares |  | 27.0 |  |
Amended 2010 Plan | Maximum Achievement Goals |  |  |  |
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 (in shares) | shares |  | 23.0 |  |
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 |  |
Accelerated vesting period for individuals who meet the age and service requirements |  | 6 months |  |
Exercise period after termination |  | 90 days |  |
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 | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
General vesting period |  | 3 years |  |
Accelerated vesting period for individuals who meet the age and service requirements |  | 6 months |  |
Amended 2010 Plan | Performance Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Accelerated vesting period for individuals who meet the age and service requirements |  | 6 months |  |

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