Segment Information - Worldwide Revenues by Categories (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 594,069	$ 689,246
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	669,965	780,126
Operating Segments | Dolls
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	225,869	252,886
Operating Segments | Infant, Toddler, and Preschool
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	140,320	193,626
Operating Segments | Vehicles
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	185,651	183,361
Operating Segments | Action Figures, Building Sets, and Games
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	118,125	150,253
Sales adjustments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (75,896)	$ (90,880)