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Joint Ventures (Details)	3 Months Ended			12 Months Ended
Joint Ventures (Details)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2017	Oct. 31, 2016	Nov. 30, 2014	Sep. 30, 2012
Joint Ventures (Details) [Line Items]
Income (Loss) from Equity Method Investments	$ 0	$ 2,000
Net Income (Loss) Attributable to Noncontrolling Interest	$ 35,000	40,000
Pacific Animation Partners Joint Venture [Member]
Joint Ventures (Details) [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Number of Projects Completed	65
Income (Loss) from Equity Method Investments		2,000
Equity Method Investments
DreamPlay Toys [Member]
Joint Ventures (Details) [Line Items]
Equity Method Investment, Ownership Percentage									50.00%
DreamPlay, LLC [Member]
Joint Ventures (Details) [Line Items]
Equity Method Investment, Ownership Percentage				5.00%
Payments to Acquire Interest in Joint Venture				$ 7,000,000.0
Other than Temporary Impairment Losses, Investments			$ 7,000,000.0
Joint Venture With Meisheng Cultural & Creative Corp. [Member]
Joint Ventures (Details) [Line Items]
Equity Method Investment, Ownership Percentage								51.00%
Net Income (Loss) Attributable to Noncontrolling Interest	35,000	40,000
Hong Kong Meisheng Cultural Co [Member]
Joint Ventures (Details) [Line Items]
Equity Method Investment, Ownership Percentage							50.00%
Net Income (Loss) Attributable to Noncontrolling Interest
Related Party Transaction, Purchases from Related Party	7.5	$ 9,000,000.0
Due to Related Parties	$ 6,000,000.0				$ 10,100,000
Hong Kong Meisheng Cultural Co [Member] \| Minimum [Member] \| JAKKS Pacific [Member]
Joint Ventures (Details) [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	8.50%					10.00%