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Share-Based Payments - Narrative (Detail)	12 Months Ended
Share-Based Payments - Narrative (Detail)	Dec. 31, 2020 USD ($) Age incentiveProgram $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 60,168,000	$ 55,968,000	$ 48,915,000
Total unrecognized compensation cost related to unvested share-based payments	$ 77,700,000
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	$ 4.60	$ 5.09	$ 5.46
Intrinsic value of stock options outstanding	$ 30,000,000
Weighted average remaining life of stock options outstanding	5 years
Intrinsic value of stock options exercisable	$ 7,000,000.0
Weighted average remaining life of stock options exercisable	3 years 10 months 24 days
Stock options vested or expected to vest (in shares) \| shares	21,100,000
Intrinsic value of stock options vested or expected to vest	$ 27,500,000
Weighted average exercise price of stock options vested or expected to vest (USD per share) \| $ / shares	$ 22.33
Weighted average remaining life of stock options vested or expected to vest	4 years 10 months 24 days
Approximate stock options vested (in shares) \| shares	3,000,000
Approximate total grant date fair value of stock options vested	$ 11,000,000	$ 8,000,000	$ 12,000,000
Weighted average grant date fair value of restricted stock units expected to vest (USD per share) \| $ / shares	$ 12.59
Number of long-term incentive programs \| incentiveProgram	3
Long-term incentive program, performance target duration	3 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 11,600,000	11,300,000	8,400,000
Income tax benefits (expense) from share-based payment arrangements	$ 0	0	$ 0
Market-Based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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
Share-based compensation	$ 28,600,000	33,600,000	$ 37,500,000
Income tax benefits (expense) from share-based payment arrangements	$ 0	0	0
Stock units expected to vest (in shares) \| shares	3,500,000
Total grant date fair value of restricted stock units vested	$ 31,000,000	$ 36,000,000	$ 43,000,000
Weighted average grant date fair value (USD per share) \| $ / shares	$ 11.18	$ 13.28	$ 15.71
Awards vested during the period (in shares) \| shares	1,970,000	1,997,000	2,048,000
Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General vesting period	3 years
Income tax benefits (expense) from share-based payment arrangements	$ 0	$ 0	$ 0
Stock units expected to vest (in shares) \| shares	4,000,000
Weighted average grant date fair value of restricted stock units expected to vest (USD per share) \| $ / shares	$ 13.93
Total grant date fair value of restricted stock units vested	$ 2,000,000
Long term incentive compensation expenses	$ 19,900,000	$ 11,000,000.0	$ 3,000,000.0
Weighted average grant date fair value (USD per share) \| $ / shares	$ 11.93	$ 14.89	$ 15.08
Awards vested during the period (in shares) \| shares	95,000	0	0
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%
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%
Amended 2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized \| shares	114,500,000
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 \| shares	29,000,000
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 \| shares	23,000,000
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	six months
Amended 2010 Plan \| 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	1
Amended 2010 Plan \| 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	1
Amended 2010 Plan \| Stock Options \| Grants on or after March 2, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued per RSU award	1
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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of stock options granted (USD per share) \| $ / shares			$ 4.21
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 \| shares			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 \| shares			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	six months
Amended 2010 Plan \| 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	3
Amended 2010 Plan \| 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	2.7
Amended 2010 Plan \| Restricted Stock Units (RSUs) \| Grants on or after March 2, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued per RSU award	2.35
Amended 2010 Plan \| 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	1
Amended 2010 Plan \| 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	1
Amended 2010 Plan \| Stock Appreciation Rights (SARs) \| Grants on or after March 2, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued per RSU award	1
Amended 2010 Plan \| 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	3
Amended 2010 Plan \| 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	2.7
Amended 2010 Plan \| Restricted Stock \| Grants on or after March 2, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued per RSU award	2.35