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Non-Controlling Interests - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended | 93 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2014 USD ($) Film | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Non-controlling Interests |  |  |  |  |  |  |
Non-controlling interest | $ 82,804 |  | $ 82,804 |  |  | $ 82,804 | $ 78,519
Net income (loss) attributable to non-controlling interest | $ 2,034 | $ (1,275) | 9,473 | $ (15,412) |  |  |
Investment in film assets |  |  | $ 10,035 | 6,177 |  |  |
IMAX China Noncontrolling Interest [Member] |  |  |  |  |  |  |
Non-controlling Interests |  |  |  |  |  |  |
Minority Interest Ownership Percentage By Company | 69.83% |  | 69.83% |  |  | 69.83% |
IMAX China |  |  |  |  |  |  |
Non-controlling Interests |  |  |  |  |  |  |
Non-controlling interest | $ 82,800 |  | $ 82,800 |  |  | $ 82,800 |
Net income (loss) attributable to non-controlling interest | $ 2,000 | $ 2,200 | 9,500 | $ (10,300) |  |  |
Other Noncontrolling Interest [Member] |  |  |  |  |  |  |
Non-controlling Interests |  |  |  |  |  |  |
Net income (loss) attributable to non-controlling interest |  |  | $ 1 |  |  |  |
Non-controlling interest description |  |  | The Company’s Original Film Fund was established in 2014 to co-finance a portfolio of 10 original large-format films. The initial investment in the Original Film Fund was committed by a third party in the amount of $25.0 million, with the possibility of contributing additional funds. The Company has contributed $9.0 million to the Original Film Fund since 2014 and has reached its maximum contribution. |  |  |  |
Number of expected original films | Film |  |  |  |  | 10 |  |
Investment in film assets |  |  |  |  |  | 22,300 |
Other Noncontrolling Interest [Member] | Third Party [Member] |  |  |  |  |  |  |
Non-controlling Interests |  |  |  |  |  |  |
Expected contribution to film fund by third party |  |  |  |  | $ 25,000 |  |
Other Noncontrolling Interest [Member] | IMAX [Member] |  |  |  |  |  |  |
Non-controlling Interests |  |  |  |  |  |  |
Film fund contributions paid |  |  |  |  |  | $ 9,000 |

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