Loss Per Share - Reconciliation of Weighted Average Shares (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended								6 Months Ended
		Jun. 30, 2020		Mar. 31, 2020	[1]	Jun. 30, 2019		Mar. 31, 2019	[1]	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income (loss)		$ (23,268)	[1]	$ (11,998)		$ (22,485)	[1]	$ (29,127)		$ (35,266)	$ (51,612)
Net income attributable to non-controlling interests		8				57				48	88
Net loss attributable to JAKKS Pacific, Inc.		(23,276)				(22,542)				(35,314)	(51,700)
Preferred stock dividend		312				0				619	0
Net loss attributable to common stockholders		$ (23,588)				$ (22,542)				$ (35,933)	$ (51,700)
Shares used in net loss per share - basic and diluted (in shares)	[2]	3,064				2,360				3,043	2,358
Loss per share - basic and diluted (in dollars per share)	[2]	$ (7.70)				$ (9.55)				$ (11.81)	$ (21.93)

[1] After giving effect to a 1 for 10 reverse stock split effective July 9, 2020.

[2] After giving effect to a 1 for 10 reverse stock split effective July 9, 2020.