Comprehensive Income (Loss) - Components of Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Equity [Abstract]
Net Income (Loss)	$ 16,414	$ (22,485)	$ (29,127)	$ 15,699	$ (18,588)	$ (36,193)	$ (35,198)	$ (39,082)
Other comprehensive income (loss):
Foreign currency translation adjustment	(898)	$ (450)	$ 1,303	(1,149)	$ (1,390)	$ 1,050	(45)	(1,489)
Comprehensive income (loss)	15,516			14,550			(35,243)	(40,571)
Less: Comprehensive income (loss) attributable to non-controlling interests	(31)			17			57	39
Comprehensive income (loss) attributable to JAKKS Pacific, Inc.	$ 15,547			$ 14,533			$ (35,300)	$ (40,610)