Loss Per Share - Reconciliation of Weighted Average Shares (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income (loss)	$ (11,998)	$ (29,127)
Net income attributable to non-controlling interests	40	31
Net loss attributable to JAKKS Pacific, Inc.	(12,038)	(29,158)
Preferred stock dividend	307	0
Net loss attributable to common stockholders	$ (12,345)	$ (29,158)
Shares used in net loss per share - basic and diluted (in shares)	30,208	23,557
Loss per share - basic and filuted (in dollars per share)	$ (0.41)	$ (1.24)