Segment Information - Worldwide Revenues by Categories (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 1,631,691	$ 1,481,557	$ 2,957,897	$ 3,030,866
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,818,403	1,656,910	3,302,928	3,399,302
Operating Segments | Dolls
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	690,466	567,598	1,177,358	1,093,890
Operating Segments | Infant, Toddler, and Preschool
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	404,064	430,973	744,208	876,595
Operating Segments | Vehicles
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	369,388	346,939	713,723	744,437
Operating Segments | Action Figures, Building Sets, Games, and Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	354,485	311,400	667,639	684,380
Sales adjustments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (186,712)	$ (175,353)	$ (345,031)	$ (368,436)