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Investments in affiliates and joint ventures - Summary of Movement in Investments In Affiliates and Joint Ventures (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Equity Method Investment, Financial Statement, Reported Amounts [Roll Forward] |  |
Balance, beginning of the year | $ 11,788 | $ 0
Additions | 0 | 11,728
Dividends, repayments of loans and other adjustments | (8,685) | 0
Share of net income | 2,780 | 60
Balance, end of the year | 42,908 | 11,788
Nuna Logistics Partnership |  |
Equity Method Investment, Financial Statement, Reported Amounts [Roll Forward] |  |
Additions | $ 37,025 | $ 0

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