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Shareholders' capital - Additional Information (Detail)
$ / shares in Units, $ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2024
$ / shares
Feb. 19, 2020
$ / shares
shares
Dec. 20, 2018
USD ($)
$ / shares
shares
Dec. 20, 2018
CAD ($)
shares
Apr. 24, 2018
USD ($)
$ / shares
shares
Apr. 24, 2018
CAD ($)
shares
Oct. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
Right
vote
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
$ / shares
shares
Dec. 31, 2019
CAD ($)
$ / shares
shares
Feb. 28, 2019
USD ($)
Dec. 31, 2018
$ / shares
Dec. 20, 2018
$ / shares
Apr. 24, 2018
$ / 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               50.00%                
Discount rate on share purchases under dividend reinvestment plan               5.00%                
Dividend reinvestment plan shares issued (in shares)               1,244,696                
Carrying amount C$               $ 184,299,000 $ 184,299,000 $ 184,299,000 $ 184,299,000        
Preferred stock redemption price per share (in CAD per share) | $ / shares                       $ 25        
Total share-based compensation expense | $               $ 10,553,000   $ 9,458,000            
Options exercised (in shares)               3,882,505   1,589,211            
Options exercised (CAD per share) | $ / shares                 $ 11.23   $ 10.66          
Minimum                                
Stockholders Equity Note [Line Items]                                
Percentage of outstanding stock to be purchased to acquire discount (or more)               20.00%                
Employee Stock Option                                
Stockholders Equity Note [Line Items]                                
Total share-based compensation expense | $               $ 1,288,000   $ 2,054,000            
Unrecognized compensation costs, non-vested options | $               $ 1,252,000 $ 1,252,000              
Unrecognized compensation costs, non-vested options, period of recognition               1 year 8 months 4 days                
Stock Option Plans | Maximum                                
Stockholders Equity Note [Line Items]                                
Percentage of shares reserves under plan (must not exceed)               8.00%                
Performance Share Units                                
Stockholders Equity Note [Line Items]                                
Maximum aggregate number of shares reserved for future issuance (in shares)               7,000,000 7,000,000     7,000,000        
Performance share units granting period               3 years                
Percentage of shares issued on number of PSU grants, minimum               2.00%                
Percentage of shares issued on number of PSU grants, maximum               237.00%                
Employee share purchase                                
Stockholders Equity Note [Line Items]                                
Total share-based compensation expense | $               $ 322,000   $ 312,000            
Vesting period of matching contribution shares               1 year                
Maximum aggregate number of shares reserved for future issuance (in shares)               2,000,000 2,000,000     2,000,000        
Common stock, shares issued (in shares)               253,538 253,538 252,698 252,698 253,538        
Deferred Share Units                                
Stockholders Equity Note [Line Items]                                
Maximum aggregate number of shares reserved for future issuance (in shares)               1,000,000 1,000,000     1,000,000        
Shares issued during period (in shares)               460,418   380,656            
Performance and restricted share units                                
Stockholders Equity Note [Line Items]                                
Total share-based compensation expense | $               $ 8,145,000   $ 6,378,000            
Unrecognized compensation costs, non-vested awards | $               $ 12,750,000 $ 12,750,000              
Unrecognized compensation costs, non-vested options, period of recognition               1 year 10 months 9 days                
Series A Preferred Stock                                
Stockholders Equity Note [Line Items]                                
Preferred stock issued (in shares)               4,800,000 4,800,000 4,800,000 4,800,000 4,800,000        
Shares issued, price per share (CAD per share) | (per share)                   $ 25 $ 25 $ 25        
Carrying amount C$               $ 100,463,000 $ 100,463,000 $ 100,463,000 $ 100,463,000 $ 116,546        
Fixed cumulative annual dividend per share (CAD per share) | (per share)               $ 1.2905 $ 1.2905         $ 1.125    
Subsequent yield period               5 years                
Preferred stock, Subsequent redemption period               5 years                
Series C Preferred Stock                                
Stockholders Equity Note [Line Items]                                
Preferred stock redemption price per share (in CAD per share) | $ / shares                       $ 53,400        
Redeemable preferred stock issued (in shares)               100 100     100        
Series D Preferred Stock                                
Stockholders Equity Note [Line Items]                                
Preferred stock issued (in shares)               4,000,000 4,000,000 4,000,000 4,000,000 4,000,000        
Shares issued, price per share (CAD per share) | (per share)                   $ 25 $ 25 $ 25        
Carrying amount C$               $ 83,836,000 $ 83,836,000 $ 83,836,000 $ 83,836,000 $ 97,259        
Fixed cumulative annual dividend per share (CAD per share) | $ / shares                       $ 1.25        
Preferred stock, Subsequent redemption period               5 years                
Government of Canada Bond Yield | Series A Preferred Stock                                
Stockholders Equity Note [Line Items]                                
Dividend variable interest rate               2.94%                
Range One | Employee share purchase                                
Stockholders Equity Note [Line Items]                                
Employer matching contribution, percent               20.00%                
Range Two | Employee share purchase                                
Stockholders Equity Note [Line Items]                                
Employer matching contribution, percent               10.00%                
Public Stock Offering                                
Stockholders Equity Note [Line Items]                                
Sale of stock, price per share | (per share)     $ 10.09   $ 9.23   $ 13.50               $ 13.76 $ 11.85
Issuance cost     $ 366,000 $ 492 $ 590,000 $ 765 $ 14,418,000                  
Public Stock Offering | Common shares                                
Stockholders Equity Note [Line Items]                                
Number of shares issued pursuant to public offering     12,536,350 12,536,350 37,505,274 37,505,274 26,252,542                  
Cash proceeds from issuance of shares     $ 126,485,000 $ 172,500 $ 346,458,000 $ 444,437 $ 354,409,000                  
ATM Equity Program                                
Stockholders Equity Note [Line Items]                                
Number of shares issued pursuant to public offering               1,756,799                
Cash proceeds from issuance of shares | $               $ 21,704,000                
Sale of stock, program costs | $               2,122,000                
Sale Of Stock, Consideration Received On Transaction, Gross | $               $ 22,034,000                
Sale of Stock, Value of Shares Issued in Transaction | $                         $ 250,000      
Shares issued, price per share (CAD per share) | $ / shares               $ 12.54 $ 12.54              
Forecast | Series D Preferred Stock                                
Stockholders Equity Note [Line Items]                                
Fixed cumulative annual dividend per share (CAD per share) | $ / shares $ 1.2728                              
Preferred stock redemption price per share (in CAD per share) | $ / shares $ 25                              
Forecast | Government of Canada Bond Yield | Series D Preferred Stock                                
Stockholders Equity Note [Line Items]                                
Basis spread on variable rate 3.28%                              
Subsequent Event                                
Stockholders Equity Note [Line Items]                                
Options exercised (in shares)   394,939                            
Options exercised (CAD per share) | $ / shares   $ 12.77                            
Subsequent Event | Common shares                                
Stockholders Equity Note [Line Items]                                
Options settled at cash value for payment of the exercise price and for tax withholdings (in shares)   279,422                            
Subsequent Event | Treasury Stock, Common                                
Stockholders Equity Note [Line Items]                                
Shares issued from treasury for option exercise (in shares)   115,517