Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Benefit Cost

A summary of the components of net periodic benefit cost for Mattel's defined benefit pension plans is as follows:

	For the Three Months Ended				For the Nine Months Ended
	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
	(In thousands)				(In thousands)
Service cost	$	1,194	$	1,015	$	3,780	$	3,236
Interest cost	2,525		3,729		7,595		11,247
Expected return on plan assets	(4,627)		(4,899)		(13,891)		(14,722)
Amortization of prior service cost	54		37		275		123
Recognized actuarial loss	2,832		2,355		8,401		7,070
Settlement loss	3,375		—		3,375		—
	$	5,353	$	2,237	$	9,535	$	6,954

A summary of the components of net periodic benefit cost for Mattel's postretirement benefit plans is as follows:

	For the Three Months Ended				For the Nine Months Ended
	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
	(In thousands)				(In thousands)
Interest cost	$	19	$	35	$	59	$	104
Amortization of prior service credit	(509)		(509)		(1,528)		(1,528)
Recognized actuarial gain	(2)		(19)		(7)		(56)
	$	(492)	$	(493)	$	(1,476)	$	(1,480)