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Share-based payment arrangements - Additional Information (Details)
$ in Thousands
 12 Months Ended
Jun. 20, 2018
OptionPlans
Dec. 31, 2019
USD ($)
shares
Options
Tranches
Dec. 31, 2018
USD ($)
shares
Options
Dec. 31, 2019
CAD ($)
shares
Options
Dec. 31, 2018
CAD ($)
shares
Options
Dec. 31, 2017
Options
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number of share options exercised in share-based payment arrangement (in shares) | shares   56,644 0      
Employee stock option plan            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number of share option plans | OptionPlans 2          
Term of employee option plan   5 years        
Number of tranches | Tranches   3        
Vesting percentage on first anniversary   33.33%        
Vesting percentage on second anniversary   33.33%        
Vesting percentage on third anniversary   33.33%        
Number of share options available to grant under the plan (in shares) | shares   3,748,454 3,928,361      
Weighted average exercise price of share purchase options vested and exercisable (in Cdn$ per share) | $       $ 10.43    
Weighted average fair value per stock option (in Cdn$ per share) | $       $ 2.19 $ 2.32  
Restricted share unit plan            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Maximum number of shares reserved for issue under options (in shares)   5,000,000   5,000,000    
Number of share purchased held in trust share-based payment arrangement (in shares) | shares   370,549 508,127      
Number of share purchase options vested and exercisable (in shares) | shares   29,111 29,371 29,111 29,371  
Restricted Shares Without Performance Criteria            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Vesting percentage on first anniversary   33.33%        
Vesting percentage on second anniversary   33.33%        
Vesting percentage on third anniversary   33.33%        
Number of share options granted in share-based payment arrangement (in shares)   391,092 214,859      
Weighted average fair value per stock option (in Cdn$ per share) | $       $ 5.68    
Number of shares outstanding (in shares)   536,330 333,119 536,330 333,119 341,198
Restricted Shares With Performance Criteria            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Term of employee option plan   3 years        
Number of share options granted in share-based payment arrangement (in shares)   412,473 167,976      
Number of shares outstanding (in shares)   457,498 152,927 457,498 152,927 0
Restricted Shares With Performance Criteria | Bottom of range            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Performance target award range (as a percent)   0.00%        
Restricted Shares With Performance Criteria | Top of range            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Performance target award range (as a percent)   200.00%        
Deferred Share Units Plans            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Trading days   15 days        
Number of shares outstanding (in shares)   362,433 234,125 362,433 234,125  
Liabilities from share-based payment transactions | $   $ 2,911 $ 686      
Performance share unit            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Maximum number of shares reserved for issue under options (in shares)   626,000   626,000    
Number of share options granted in share-based payment arrangement (in shares)   264,083 261,522      
Number of shares outstanding (in shares)   610,885 484,899 610,885 484,899 381,293
Performance share unit | Bottom of range            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Performance target award range (as a percent)   0.00%        
Performance share unit | Top of range            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Performance target award range (as a percent)   200.00%        
PSU Plan, Performance Share Unit            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number of share options granted in share-based payment arrangement (in shares)     261,523