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Joint Ventures (Detail) shares in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2012 USD ($) shares | Mar. 31, 2020 USD ($) episode | Mar. 31, 2019 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2019 USD ($) | Oct. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Net income (loss) attributable to non-controlling interests |  | $ 40,000 | $ 31,000 |  |  |  |
Pacific Animation Partners Joint Venture |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 50.00% |  |  |  |  |
Number of episodes for which production completed | episode |  | 65 |  |  |  |  |
Equity in net income/(loss) of joint venture |  | $ 2,000 | 0 |  |  |  |
Equity method investments |  | $ 0 |  |  |  | $ 0 |
DreamPlay Toys |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |  |  |  |
Cash paid to Nant Works for joint venture | $ 8,000,000.0 |  |  |  |  |  |
DreamPlay Toys | Technology Rights |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Impairment charge |  |  |  | $ 2,900,000 |  |  |
DreamPlay, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  | 5.00% |  |
Cash paid to Nant Works for joint venture |  |  |  |  | $ 7,000,000.0 |  |
Impairment charge |  |  |  | $ 7,000,000.0 |  |  |
Joint Venture With Meisheng Culture & Creative Corp. |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 51.00% |  |  |  |  |
Net income (loss) attributable to non-controlling interests |  | $ 40,000 | 31,000 |  |  |  |
Hong Kong Meisheng Cultural Co |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Purchases from related party |  | 9,000,000.0 | 2,200,000 |  |  |  |
Due to related parties |  | $ 8,400,000 | 600,000 |  |  |  |
Hong Kong Meisheng Cultural Co | Minimum | JAKKS Pacific |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage |  | 10.00% |  |  |  |  |
Hong Kong Meisheng Cultural Co |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  | 50.00%
Net income (loss) attributable to non-controlling interests |  | $ 0 | $ 0 |  |  |  |
Hong Kong Meisheng Cultural Co | Minimum | JAKKS Pacific |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage |  | 10.00% |  |  |  |  |
NantWorks | DreamPlay Toys |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Issue of warrants (in shares) | shares | 1.5 |  |  |  |  |  |
Investment in DreamPlay LLC | $ 7,000,000.0 |  |  |  |  |  |

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