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Statements of Financial Position (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Assets    
Current assets $ 470,670 $ 319,757
Property, plant and equipment 2,303,338 2,258,391
Accounts receivable, intercompany 413,925 255,740
Liabilities and shareholders' equity    
Current liabilities 410,029 238,120
Long-term debt 1,085,970 1,106,794
Accounts payable and accrued liabilities, intercompany 392,053 224,123
Parent And Guarantor Subsidiaries [Member]    
Assets    
Current assets 378,740 219,013
Property, plant and equipment 1,959,329 1,909,951
Other non-current assets 97,691 79,033
Accounts receivable, intercompany 52,649 34,373
Short-term advances to affiliates 11,753 11,686
Liabilities and shareholders' equity    
Current liabilities 365,025 200,784
Long-term debt 1,085,970 1,106,794
Other non-current liabilities 144,477 87,411
Accounts payable and accrued liabilities, intercompany 41,202 33,820
Long-term advances from affiliates $ 183,330 $ 128,606