Adjustments for share-based payments to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]

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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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Summary of Contractual Maturities of Financial Liabilities and Other Contractual Commitments (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CAD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CAD ($)	Dec. 31, 2017 USD ($)
Disclosure of Nonderivative Financial Instruments [Line Items]
Long-term debt, gross	$ 1,729,351	$ 1,266,729	$ 1,758,519	$ 1,398,625
2021 [Member]
Disclosure of Nonderivative Financial Instruments [Line Items]
Long-term debt, gross	226,113
2023 [Member]
Disclosure of Nonderivative Financial Instruments [Line Items]
Long-term debt, gross	477,823
Thereafter [Member]
Disclosure of Nonderivative Financial Instruments [Line Items]
Long-term debt, gross	1,025,415
Liquidity risk [Member]
Disclosure of Nonderivative Financial Instruments [Line Items]
Accounts payable and accrued liabilities	(274,489)
Share based compensation	16,660
Long-term debt, gross	1,729,351
Interest on long-term debt	648,918
Commitments	247,775
Financial Liabilities, Carrying Amount	2,917,193
Liquidity risk [Member] \| 2019 [Member]
Disclosure of Nonderivative Financial Instruments [Line Items]
Accounts payable and accrued liabilities	(274,489)
Share based compensation	6,221
Interest on long-term debt	115,802
Commitments	101,542
Financial Liabilities, Carrying Amount	498,054
Liquidity risk [Member] \| 2020 [Member]
Disclosure of Nonderivative Financial Instruments [Line Items]
Share based compensation	4,357
Interest on long-term debt	115,802
Commitments	84,404
Financial Liabilities, Carrying Amount	204,563
Liquidity risk [Member] \| 2021 [Member]
Disclosure of Nonderivative Financial Instruments [Line Items]
Share based compensation	6,082
Long-term debt, gross	226,113
Interest on long-term debt	115,190
Commitments	27,811
Financial Liabilities, Carrying Amount	375,196
Liquidity risk [Member] \| 2022 [Member]
Disclosure of Nonderivative Financial Instruments [Line Items]
Interest on long-term debt	101,105
Commitments	8,604
Financial Liabilities, Carrying Amount	109,709
Liquidity risk [Member] \| 2023 [Member]
Disclosure of Nonderivative Financial Instruments [Line Items]
Long-term debt, gross	477,823
Interest on long-term debt	99,562
Commitments	7,617
Financial Liabilities, Carrying Amount	585,002
Liquidity risk [Member] \| Thereafter [Member]
Disclosure of Nonderivative Financial Instruments [Line Items]
Long-term debt, gross	1,025,415
Interest on long-term debt	101,457
Commitments	17,797
Financial Liabilities, Carrying Amount	$ 1,144,669