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Capital Stock and Reserves - Stock-based Compensation by Plan Type (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense by plan type | $ 6,109 | $ 5,310 | $ 18,211 | $ 15,969
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense by plan type | 253 | 433 | 808 | 1,449
Restricted Share Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense by plan type | 3,900 | 3,430 | 11,524 | 10,866
Performance Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense by plan type | 1,183 | 483 | 3,169 | 1,229
IMAX China Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense by plan type | 41 | 600 | 143 | 701
IMAX China Long Term Incentive Plan Restricted Share Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense by plan type | 600 | 332 | 2,217 | 1,645
IMAX China Long Term Incentive Plan Performance Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense by plan type | $ 132 | $ 32 | $ 350 | $ 79

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