Selected Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Information - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Quarterly Financial Information [Abstract]
Net sales	$ 128,267,000	$ 242,290,000	$ 78,758,000	$ 66,557,000	$ 152,511,000	$ 280,130,000	$ 95,182,000	$ 70,826,000	$ 515,872,000		$ 598,649,000		$ 567,810,000
Gross profit	42,029,000	74,616,000	16,770,000	16,350,000	46,400,000	80,859,000	17,746,000	14,340,000	149,765,000		159,345,000		155,716,000
Income (loss) from operations	1,127,000	37,513,000	(9,746,000)	(15,986,000)	(10,761,000)	35,662,000	(18,649,000)	(24,041,000)	12,908,000		(17,789,000)		(32,173,000)
Income (loss) before provision (benefit) for income taxes	(10,855,000)	32,164,000	(22,996,000)	(11,722,000)	(19,629,000)	17,430,000	(21,896,000)	(29,372,000)	(13,409,000)		(53,467,000)		(39,474,000)
Net income (loss)	(11,309,000)	32,431,000	(23,268,000)	(11,998,000)	(20,181,000)	16,414,000	(22,485,000)	(29,127,000)	(14,144,000)		(55,379,000)		(42,425,000)
Net income (loss) attributable to JAKKS Pacific, Inc.	(11,342,000)	32,382,000	(23,276,000)	(12,038,000)	(20,293,000)	16,445,000	(22,542,000)	(29,158,000)	(14,274,000)	[1]	(55,548,000)	[1]	(42,368,000)	[1]
Net income (loss) attributable to common stockholders	$ (11,664,000)	$ 32,066,000	$ (23,588,000)	$ (12,345,000)	$ (20,596)	$ 16,265,000	$ (22,542,000)	$ (29,158,000)	$ (15,531,000)		$ (56,031,000)		$ (42,368,000)
Basic earnings (loss) per share (in Dollars per share)	$ (2.55)	$ 8.39	$ (7.70)	$ (4.10)	$ (7.00)	$ 6.00	$ (9.60)	$ (12.40)
Weighted average shares Outstanding (in Shares)	4,575	3,824	3,064	3,021	2,962	2,709	2,360	2,356
Diluted earnings (loss) per share (in Dollars per share)	$ (2.55)	$ 3.19	$ (7.70)	$ (4.10)	$ (7.00)	$ 5.10	$ (9.60)	$ (12.40)
Weighted average shares and equivalents outstanding (in Shares)	4,575	9,307	3,064	3,021	2,962	6,035	2,360	2,356

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