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Components of Changes in Non-cash Working Capital Balances (Detail) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Change In Noncash Working Capital Balances [Abstract]    
Accounts receivable $ (32,709) $ (41,309)
Inventory (7,504) (3,902)
Accounts payable and accrued liabilities 23,225 (30,158)
Non cash working capital (16,988) (75,369)
Operations (17,880) (67,380)
Investments $ 892 $ (7,989)