Segment Information - Worldwide Revenues by Brand Category (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 1,437,451	$ 1,560,983	$ 2,986,571	$ 3,271,078
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,606,636	1,710,164	3,360,767	3,593,308
Operating Segments | Barbie
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	374,707	329,609	698,131	605,175
Operating Segments | Hot Wheels
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	234,993	249,984	547,239	514,036
Operating Segments | Fisher-Price and Thomas & Friends
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	409,497	463,689	833,468	944,680
Operating Segments | American Girl
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	64,257	93,760	176,902	246,865
Operating Segments | Toy Box
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	523,182	573,122	1,105,027	1,282,552
Operating Segments | Product
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,606,636	1,710,164	3,360,767	3,593,308
Segment Reconciling Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (169,185)	$ (149,181)	$ (374,196)	$ (322,230)