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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
	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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The amount of net income (loss) reported by an equity method investment of the entity.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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