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Summary of Contractual Maturities of Financial Liabilities and Other Contractual Commitments (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CAD ($)
Disclosure of Nonderivative Financial Instruments [Line Items]          
Long-term debt, gross   $ 874,858 $ 1,123,890,000 $ 981,151 $ 1,249,153,000
Liquidity risk [Member]          
Disclosure of Nonderivative Financial Instruments [Line Items]          
Accounts payable and accrued liabilities     224,123,000    
Share based compensation $ 67,487,000        
Long-term debt, gross     1,126,113,000    
Interest on long-term debt 392,838,000        
Commitments     179,631,000    
Total     1,990,192,000    
Liquidity risk [Member] | 2022 [Member]          
Disclosure of Nonderivative Financial Instruments [Line Items]          
Accounts payable and accrued liabilities     224,123,000    
Share based compensation 18,414,000        
Long-term debt, gross     2,223,000    
Interest on long-term debt 72,147,000        
Commitments     53,030,000    
Total     369,937,000    
Liquidity risk [Member] | 2023 [Member]          
Disclosure of Nonderivative Financial Instruments [Line Items]          
Accounts payable and accrued liabilities     0    
Share based compensation 24,331,000        
Long-term debt, gross     2,223,000    
Interest on long-term debt 72,071,000        
Commitments     69,631,000    
Total     168,256,000    
Liquidity risk [Member] | 2024 [Member]          
Disclosure of Nonderivative Financial Instruments [Line Items]          
Accounts payable and accrued liabilities     0    
Share based compensation 24,742,000        
Long-term debt, gross     2,223,000    
Interest on long-term debt 71,996,000        
Commitments     44,068,000    
Total     143,029,000    
Liquidity risk [Member] | 2025 [Member]          
Disclosure of Nonderivative Financial Instruments [Line Items]          
Accounts payable and accrued liabilities     0    
Share based compensation 0        
Long-term debt, gross     160,257,000    
Interest on long-term debt 69,433,000        
Commitments     5,688,000    
Total     235,378,000    
Liquidity risk [Member] | 2026 [Member]          
Disclosure of Nonderivative Financial Instruments [Line Items]          
Accounts payable and accrued liabilities     0    
Share based compensation 0        
Long-term debt, gross     453,403,000    
Interest on long-term debt 36,196,000        
Commitments     4,823,000    
Total     494,422,000    
Liquidity risk [Member] | Thereafter [Member]          
Disclosure of Nonderivative Financial Instruments [Line Items]          
Accounts payable and accrued liabilities     0    
Share based compensation 0        
Long-term debt, gross     505,784,000    
Interest on long-term debt $ 70,995,000        
Commitments     2,391,000    
Total     $ 579,170,000