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Income Taxes - Tax rate reconciliation (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Abstract]
Loss before income taxes and non-controlling interest	$ (207,237)	$ (154,234)
Combined federal and provincial tax rate	26.70%	26.90%
Computed income tax recovery	$ (55,332)	$ (41,489)
Increase Decrease In Taxes Abstract
Difference between Canadian rates and rates applicable to subsidiaries in other countries	(51,526)	(175,092)
Change in unrecognized deferred tax assets	70,353	106,766
Other taxes	0	(2,278)
Share-based compensation plans	1,349	1,221
Change in tax provision related to transfer pricing	3,000	8,000
Non-deductible (non-taxable) capital amounts	3,034	0
Change in legislation	(12,199)	0
Non-deductible goodwill impairment	35,520	0
Other permanent differences	3,282	8,517
Income tax recovery	$ (2,519)	$ (94,355)

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The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to change in unrecognized deferred tax assets.

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The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to Transfer Pricing.

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The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to NonDeductibleCapitalAmounts.

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The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to OtherPermanentDifferences.

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The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to share based compensation plans.

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The amount of profit (loss) for a period before deducting tax expense. [Refer: Profit (loss)]

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The applicable income tax rate.

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to changes in the tax rate. [Refer: Accounting profit]

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