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Shareholders' Equity and Share Based Compensation - Summary of Performance base restricted share unit activity (Detail) - Performance-Based Restricted Share Unit [Member] - $ / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]      
Number of Performance-based Restricted Share Units, Beginning balance 869,000 739,000 1,056,666
Number of Performance-based Restricted Share Units, Granted 158,000 1,068,000 355,000
Number of Performance-based Restricted Share Units, Received     (442,666)
Number of Performance-based Restricted Share Units, Forfeited   (98,000)  
Number of Performance-based Restricted Share Units, Exercised (487,000)    
Number of Performance-based Restricted Share Units, Forfeited/expired (310,000)   (230,000)
Number of Performance-based Restricted Share Units, Ending balance 230,000 869,000 739,000
Number of Performance-based Restricted Share Units, Exercisable 200,000 75,000 30,000
Weighted Average Grant Date Fair Value, Beginning balance $ 7.51 $ 7.92 $ 5.56
Weighted Average Grant Date Fair Value, Granted 9.68 6.36 14.94
Weighted Average Grant Date Fair Value, Received     7.82
Weighted Average Grant Date Fair Value, Forfeited   9.59  
Weighted Average Grant Date Fair Value, Exercised 7.14    
Weighted Average Grant Date Fair Value, Forfeited/expired 8.35   12.90
Weighted Average Grant Date Fair Value, Ending balance 8.67 7.51 7.92
Weighted Average Grant Date Fair Value, Exercisable $ 8.24 $ 6.10 $ 12.87
Exercise price in CA$6.47      
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]      
Number of Performance-based Restricted Share Units, Granted   (840,000)  
Weighted Average Grant Date Fair Value, Granted   $ 6.47