XML 82 R63.htm IDEA: XBRL DOCUMENT v3.21.2
Shareholders' capital - Additional Information (Detail)
 3 Months Ended 6 Months Ended 30 Months Ended
Aug. 05, 2021
shares
Apr. 15, 2021
shares
Jun. 30, 2021
USD ($)
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
Aug. 12, 2021
USD ($)
$ / shares
shares
Stockholders Equity Note [Line Items]                
Share-based compensation expense | $     $ 3,189,000 $ 9,997,000 $ 4,386,000   $ 11,640,000  
Unrecognized compensation costs, non-vested awards | $     $ 19,712,000   $ 19,712,000 $ 19,712,000    
Unrecognized compensation costs, non-vested options, period of recognition         1 year 11 months 12 days      
Weighted average grant date fair value per option (CAD per share) | $ / shares           $ 2.46    
Options exercised (in shares)         (61,225)      
Exercised (CAD per share) | $ / shares           $ 14.75    
Treasury Stock, Common                
Stockholders Equity Note [Line Items]                
Shares issued from treasury to settles RSUs and PSUs (in shares)         12,021      
Common shares                
Stockholders Equity Note [Line Items]                
Equity other than options settled at cash value for payment of the exercise price and for tax withholdings (in shares)         49,204      
RSUs and PSUs                
Stockholders Equity Note [Line Items]                
Equity other than options granted in period (in shares)         703,620      
PSU's and RSU's exercised (in shares)         (709,853)      
RSUs and PSUs | Treasury Stock, Common                
Stockholders Equity Note [Line Items]                
Shares issued from treasury to settles RSUs and PSUs (in shares)         373,314      
RSUs and PSUs | Common shares                
Stockholders Equity Note [Line Items]                
Equity other than options settled at cash value for payment of the exercise price and for tax withholdings (in shares)         336,539      
RSUs | Subsequent Event                
Stockholders Equity Note [Line Items]                
Common stock, shares issued (in shares) 105,876              
RSUs | Treasury Stock, Common | Subsequent Event                
Stockholders Equity Note [Line Items]                
Shares issued from treasury to settles RSUs and PSUs (in shares) 49,200              
RSUs | Common shares | Subsequent Event                
Stockholders Equity Note [Line Items]                
Equity other than options settled at cash value for payment of the exercise price and for tax withholdings (in shares) 56,676              
Bonus Deferral Restricted Stock Units                
Stockholders Equity Note [Line Items]                
Awards vested (percent)   100.00%            
Equity other than options granted in period (in shares)   44,528            
Common stock, shares issued (in shares)     148,459   148,459 148,459    
Bonus Deferral Restricted Stock Units | Treasury Stock, Common                
Stockholders Equity Note [Line Items]                
Shares issued from treasury to settles RSUs and PSUs (in shares)         68,841      
Bonus Deferral Restricted Stock Units | Common shares                
Stockholders Equity Note [Line Items]                
Equity other than options settled at cash value for payment of the exercise price and for tax withholdings (in shares)     79,618          
Deferred Share Units                
Stockholders Equity Note [Line Items]                
Equity other than options granted in period (in shares)         35,549      
Common stock, shares issued (in shares)     85,210   85,210 85,210    
Deferred Share Units | Treasury Stock, Common                
Stockholders Equity Note [Line Items]                
Shares issued from treasury to settles RSUs and PSUs (in shares)     39,719          
Deferred Share Units | Common shares                
Stockholders Equity Note [Line Items]                
Equity other than options settled at cash value for payment of the exercise price and for tax withholdings (in shares)     45,491          
Executive                
Stockholders Equity Note [Line Items]                
Options granted (in shares)         437,006      
Weighted average grant date fair value per option (CAD per share) | $ / shares           $ 19.64    
Options expiration period         8 years      
Executive | Options vesting December 31, 2022                
Stockholders Equity Note [Line Items]                
Awards vested (percent)         33.33%      
Executive | Options vesting December 31, 2023                
Stockholders Equity Note [Line Items]                
Awards vested (percent)         33.33%      
Executive | Options vesting December 31, 2024                
Stockholders Equity Note [Line Items]                
Awards vested (percent)         33.33%      
ATM Equity Program                
Stockholders Equity Note [Line Items]                
Treasury atock, amount reserved for issuance under the plan | $     $ 500,000,000   $ 500,000,000 $ 500,000,000    
Number of shares issued pursuant to public offering (in shares)         16,789,922      
Sale of stock, average price per share (in USD) | $ / shares         $ 15.73      
Cash proceeds from issuance of shares | $         $ 264,112,000      
Gross proceeds from sale of stock, net of commissions | $         260,810,000      
Sale of stock, other related costs | $         $ 620,000      
ATM Equity Program | Subsequent Event                
Stockholders Equity Note [Line Items]                
Number of shares issued pursuant to public offering (in shares)               27,211,284
Sale of stock, average price per share (in USD) | $ / shares               $ 14.95
Cash proceeds from issuance of shares | $               $ 406,780,000
Gross proceeds from sale of stock, net of commissions | $               401,695,000
Sale of stock, other related costs | $               $ 4,033,000