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Capital Stock - Additional Information (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 12, 2017
USD ($)
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Jun. 06, 2019
shares
May 03, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation costs recorded for the period | $   $ 5,500,000   $ 5,600,000 $ 16,900,000   $ 17,100,000      
Stock-based compensation expense | $   $ 5,527,000   $ 5,562,000 $ 16,916,000   $ 17,146,000      
Common shares purchased in open market by trustee in connection with RSUs   45,000   0 445,000   300,000      
Weighted average price of common shares purchased in open market by trustee in connection with RSUs | $ / shares   $ 21.52   $ 0.00 $ 22.83   $ 20.55      
Number of treasury shares held in trust for future settlement of share based awards         71,664     44,579    
Value of treasury shares held in trust for future settlement of share based awards | $   $ 1,572,000 $ 1,572,000   $ 1,572,000 $ 1,572,000   $ 916,000    
Antidilutive shares issuable upon exercise of stock options and restricted share units   5,289,172   5,732,840 5,902,208   5,735,717      
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 share repurchase program for shares of the Company’s common shares. The share repurchase program expires on June 30, 2020. 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, 2020                  
Stock Repurchased And Retired During Period, Shares   46,615   0 134,384   2,154,689      
Stock Acquired, Average Cost per Share | $ / shares   $ 20.35   $ 0.00 $ 19.76   $ 21.54      
Non-controlling Interests [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Details of the share repurchase program         In 2018, 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 of IMAX China as at May 3, 2018 (35,818,112 shares). The share repurchase program expired on June 6, 2019. 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 of IMAX China as at June 6, 2019 (35,605,560 shares). The share repurchase program expires on the date of the 2020 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 Repurchased And Retired During Period, Shares   1,025,800   0 8,051,500   0      
Stock Acquired, Average Cost per Share | (per share)   $ 2.29 $ 17.90   $ 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                 35,605,560 35,818,112
Restricted Share Units [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock-based compensation expense | $   $ 2,933,000   $ 3,772,000 $ 9,175,000   $ 11,792,000      
RSU awards, Granted         649,389   658,353      
RSU awards, Vested and settled         367,020   392,066      
Antidilutive shares issuable upon exercise of stock options and restricted share units   71,321   299,859 161,378   302,736      
Restricted Share Units [Member] | Certain Advisor [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock-based compensation expense | $       $ 0     $ 0      
RSU awards, Granted         12,580          
RSU awards, Vested and settled         12,580          
Restricted Share Units [Member] | Maximum [Member] | Certain Advisor [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock-based compensation expense | $   $ 100,000     $ 100,000          
Employee Stock Option [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock-based compensation expense | $   $ 2,145,000   $ 1,489,000 $ 6,228,000   $ 4,239,000      
Antidilutive shares issuable upon exercise of stock options and restricted share units   5,217,851   5,432,981 5,740,830   5,432,981