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Share-Based Payments - Additional Information (Detail)	12 Months Ended
Share-Based Payments - Additional Information (Detail)	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