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Statements of Financial Position (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Assets    
Current assets $ 319,757 $ 342,263
Property, plant and equipment 2,258,391 2,472,683
Accounts receivable, intercompany 255,740 207,209
Liabilities and shareholders' equity    
Current liabilities 238,120 166,840
Long-term debt 1,106,794 1,236,210
Accounts payable and accrued liabilities, intercompany 224,123 150,957
Parent And Guarantor Subsidiaries [Member]    
Assets    
Current assets 219,013 227,265
Property, plant and equipment 1,909,951 2,085,460
Other non-current assets 79,033 79,104
Accounts receivable, intercompany 34,373 35,500
Short-term advances to affiliates 11,686 13,359
Liabilities and shareholders' equity    
Current liabilities 200,784 123,472
Long-term debt 1,106,794 1,236,210
Other non-current liabilities 87,411 86,303
Accounts payable and accrued liabilities, intercompany 33,820 25,374
Long-term advances from affiliates $ 128,606 $ 89,830