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Financial instruments and risk management - Maximum credit exposure (Details) - CAD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Trade accounts receivable	$ 38,686	$ 67,913
Holdbacks	7,152	558
Accrued trade receivables	13,174	9,807
Contract receivables, included in accounts receivable	59,012	78,278
Other receivables	7,734	4,121
Total accounts receivable	66,746	82,399
Contract assets	19,193	10,673	$ 21,572
Total	$ 85,939	$ 93,072

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties.

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