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Other long-term liabilities and deferred credits - Changes in Environmental Remediation Obligation (Details) - CAD CAD in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accrual for Environmental Loss Contingencies [Roll Forward]
Opening Balance	CAD 63,378	CAD 71,529
Remediation activities	(2,026)	(1,389)
Accretion	1,447	2,464
Changes in cash flow estimates	2,135	2,088
Revision in assumptions	7,686	(9,101)
Foreign exchange rate adjustment	(4,473)	(2,213)
Closing Balance	CAD 68,147	CAD 63,378

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- Definition

Accrual for Environmental Loss Contingencies, Accretion

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Accrual for Environmental Loss Contingencies, Increase (Decrease) for Revision in Assumptions

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Accrual for Environmental Loss Contingencies, Remediation Activities

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- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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- Definition

Amount of foreign currency translation gain (loss) which decreases (increases) the accrual for environmental loss contingencies.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
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-Subparagraph (SAB TOPIC 5.Y.Q2)
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Amount of expense (reversal of expense) which increases (decreases) the accrual for environmental loss contingencies from revisions in estimates to existing obligations. Excludes changes related to business acquisitions, divestitures, or currency movement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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