Segment Information - Worldwide Revenues by Categories (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 689,246	$ 708,372
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	780,126	800,011
Operating Segments | Dolls
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	252,886	257,357
Operating Segments | Infant/Toddler/Preschool
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	193,626	226,646
Operating Segments | Vehicles
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	183,361	188,933
Operating Segments | Action Figures/Building Sets/Games
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	150,253	127,075
Segment Reconciling Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (90,880)	$ (91,639)