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Capital Stock - Additional Information (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2019
$ / shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2019
$ / shares
Dec. 31, 2019
USD ($)
shares
Jun. 30, 2020
USD ($)
Jun. 11, 2020
shares
Jun. 06, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based compensation costs recorded for the period $ 5,300,000 $ 5,500,000   $ 16,000,000.0   $ 16,900,000          
Stock-based compensation expense 5,310,000 $ 5,527,000   $ 15,969,000   $ 16,916,000          
Common shares purchased in open market by trustee in connection with RSUs | shares   45,000   200,000   445,000          
Weighted average price of common shares purchased in open market by trustee in connection with RSUs | $ / shares   $ 21.52   $ 15.43   $ 22.83          
Number of treasury shares held in trust for future settlement of share based awards | shares       17,578       187,020      
Value of treasury shares held in trust for future settlement of RSUs and stock options $ 271,000     $ 271,000 $ 271,000     $ 4,038,000      
Antidilutive shares issuable upon exercise of stock options, restricted share units and performance stock units | shares 6,959,515 5,289,172   6,959,515   5,902,208          
IMAX China                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Details of the share repurchase program       In 2019, IMAX China announced that its shareholders granted its Board of Directors a general mandate authorizing the Board, subject to applicable laws, to repurchase shares of IMAX China in an amount not to exceed 10% of the total number of issued shares as at June 6, 2019 (35,605,560 shares). The share repurchase program expired on the date of the 2020 Annual General Meeting of IMAX China on June 11, 2020. During the 2020 Annual General Meeting, shareholders approved the repurchase of shares of IMAX China not to exceed 10% of the total number of issued shares as of June 11, 2020 (34,848,398 shares). This program will be valid until the 2021 Annual General Meeting of IMAX China. The repurchases may be made in the open market or through other means permitted by applicable laws. IMAX China has no obligation to repurchase its shares and the share repurchase program may be suspended or discontinued by IMAX China at any time.              
Stock Repurchase Program Expiration Date       Jun. 11, 2020              
Repurchase of common shares | shares   1,025,800   906,400   8,051,500          
Stock Acquired, Average Cost per Share | (per share)   $ 2.29 $ 17.90 $ 1.69 $ 13.13 $ 2.38 $ 18.63        
Stock Repurchase Program, maximum percentage of shares to be repurchased                   10.00% 10.00%
Stock Repurchase Program, Authorized number of shares | shares                   34,848,398 35,605,560
Stock repurchase program expiration year       2021              
Parent [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Details of the share repurchase program       In 2017, the Company’s Board of Directors approved a new $200.0 million common stock share repurchase program which would have expired on June 30, 2020. In June 2020, the Board of Directors approved a 12-month extension of this program which will now expire on June 30, 2021. The repurchases may be made either in the open market or through private transactions, subject to market conditions, applicable legal requirements and other relevant factors. The Company has no obligation to repurchase shares and the share repurchase program may be suspended or discontinued by the Company at any time.              
Stock Repurchase Program, Authorized Amount                 $ 200,000,000.0    
Stock Repurchase Program Expiration Date       Jun. 30, 2021              
Repurchase of common shares | shares 0 46,615   2,484,123   134,384          
Stock Acquired, Average Cost per Share | $ / shares   $ 20.35   $ 14.72   $ 19.76          
Restricted Share Units [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation expense $ 3,430,000 $ 2,933,000   $ 10,866,000   $ 9,175,000          
Antidilutive shares issuable upon exercise of stock options, restricted share units and performance stock units | shares 6,959,515 5,289,172   6,959,515   5,902,208          
Restricted Share Units [Member] | Certain Advisor [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation expense       $ 100,000              
Restricted Share Units [Member] | Minimum [Member] | Certain Advisor [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation expense   $ 100,000       $ 100,000          
IMAX China Stock Options [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation expense $ 600,000 86,000   701,000   230,000          
Vested stock options contractual life 2 years                    
Employee Stock Option [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation expense $ 433,000 $ 2,145,000   $ 1,449,000   $ 6,228,000          
Antidilutive shares issuable upon exercise of stock options, restricted share units and performance stock units | shares 6,959,515 5,289,172   6,959,515   5,902,208          
Performance Stock Units [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation expense $ 483,000     $ 1,229,000              
Antidilutive shares issuable upon exercise of stock options, restricted share units and performance stock units | shares 6,959,515 5,289,172   6,959,515   5,902,208