Segment Information - Worldwide Revenues by Categories (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 860,063	$ 840,748	$ 1,549,309	$ 1,549,120
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	962,266	954,120	1,742,392	1,754,131
Operating Segments | Dolls
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	273,405	266,632	526,291	523,989
Operating Segments | Infant, Toddler, and Preschool
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	251,996	288,002	445,622	514,648
Operating Segments | Vehicles
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	214,137	215,038	397,498	403,971
Operating Segments | Action Figures, Building Sets, and Games
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	222,728	184,448	372,981	311,523
Sales Adjustments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (102,203)	$ (113,372)	$ (193,083)	$ (205,011)