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Shareholders' capital - Additional Information (Detail)
$ / shares in Units, $ / shares in Units, $ in Thousands
 2 Months Ended 12 Months Ended 35 Months Ended
Mar. 03, 2022
Nov. 08, 2021
USD ($)
$ / shares
shares
Nov. 08, 2021
CAD ($)
shares
Mar. 03, 2023
shares
Dec. 31, 2022
$ / shares
Dec. 31, 2022
USD ($)
vote
right
$ / shares
shares
Dec. 31, 2021
$ / shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
shares
Aug. 15, 2022
USD ($)
Nov. 08, 2021
$ / shares
Stockholders Equity Note [Line Items]                        
Number of entitled votes per common share | vote           1            
Number of voting rights per share | right           1            
Discount rate on share purchases (percent)           50.00%            
Total share-based compensation | $           $ 10,920,000   $ 8,395,000        
Unrecognized compensation costs, non-vested awards | $                   $ 10,732,000    
Unrecognized compensation costs, non-vested options, period of recognition           1 year 9 months 18 days            
Common shares issued from treasury (in shares)           2,403            
Share based awards settled for cash value as payment for tax withholding (in shares)           2,773            
Share options                        
Stockholders Equity Note [Line Items]                        
Total share-based compensation | $           $ 980,000   $ 939,000        
Percentage of shares reserved under the plan (must not exceed)           8.00%            
ESPP                        
Stockholders Equity Note [Line Items]                        
Number of shares issued pursuant to public offering (in shares)           414,338   355,096        
Vesting period of matching contribution shares           1 year            
Maximum aggregate number of shares reserved for future issuance (in shares)                   4,000,000    
Deferred Share Units                        
Stockholders Equity Note [Line Items]                        
Maximum aggregate number of shares reserved for future issuance (in shares)                   1,000,000    
Exercise of share-based awards (in shares)           120,513   73,467        
Shares issued during period (in shares)           645,714   530,378        
Performance and restricted share units                        
Stockholders Equity Note [Line Items]                        
Maximum aggregate number of shares reserved for future issuance (in shares)                   7,000,000    
Award vesting period           3 years            
Company Match, First $5,000 Contributed by Employee                        
Stockholders Equity Note [Line Items]                        
Employer matching contribution (percent)           20.00%            
Company Match, Employee Contributions $5,001 to $10,000                        
Stockholders Equity Note [Line Items]                        
Employer matching contribution (percent)           10.00%            
Preferred shares, Series A                        
Stockholders Equity Note [Line Items]                        
Shares issued, price per share (USD and CAD per share) | $ / shares         $ 25              
Dividend declared per preferred share (USD per share) | $ / shares         1.2905   $ 1.2905          
Preferred dividend rate reset period           5 years            
Basis spread on variable rate           2.94%            
Preferred shares, Series D                        
Stockholders Equity Note [Line Items]                        
Shares issued, price per share (USD and CAD per share) | $ / shares         25              
Dividend declared per preferred share (USD per share) | $ / shares         $ 1.2728   $ 1.2728          
Preferred dividend rate reset period           5 years            
Basis spread on variable rate           3.28%            
Preferred shares, Series C                        
Stockholders Equity Note [Line Items]                        
Redeemable preferred stock issued (in shares)                   100    
ATM Equity Program                        
Stockholders Equity Note [Line Items]                        
Number of shares issued pursuant to public offering (in shares)           2,861,709     36,814,536      
Cash proceeds from issuance of shares | $           $ 38,923,000     $ 551,086,000      
Treasury stock, amount reserved for issuance under the plan | $                     $ 500,000,000  
Sale of stock, average price per share (in USD) | $ / shares           $ 13.94     $ 15.00      
Proceeds from sale of stock, net of commissions | $           $ 38,534,000     $ 544,295,000      
Sale of stock, other related costs | $           $ 558,000     $ 4,843,000      
Common shares                        
Stockholders Equity Note [Line Items]                        
Discount rate on share purchases under dividend reinvestment plan (percent) 3.00%         5.00%            
Common shares | Subsequent Event                        
Stockholders Equity Note [Line Items]                        
Dividend reinvestment plan shares issued (in shares)       4,370,289                
Common shares | Public Stock Offering                        
Stockholders Equity Note [Line Items]                        
Number of shares issued pursuant to public offering (in shares)   44,080,000 44,080,000                  
Shares issued, price per share (USD and CAD per share) | (per share)   $ 14.63                   $ 18.15
Cash proceeds from issuance of shares   $ 642,664,000 $ 800,052                  
Issuance costs | $     $ 32,583                  
Proceeds from sale of stock, net of commissions | $   $ 26,173,000                    
Exercise of share-based awards settled (in shares)           5,176   87,582        
Minimum                        
Stockholders Equity Note [Line Items]                        
Percentage of outstanding stock to be purchased to acquire discount (or more)           20.00%            
Minimum | Performance and restricted share units                        
Stockholders Equity Note [Line Items]                        
Percentage of shares issued on number of PSU grants (percent)           2.50%            
Maximum | Performance and restricted share units                        
Stockholders Equity Note [Line Items]                        
Percentage of shares issued on number of PSU grants (percent)           237.00%