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Share Based Compensation Plans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 CAD ($) shares Year Incentive_Plan	Dec. 31, 2016 CAD ($) shares Year	Dec. 31, 2016 USD ($) shares Year
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Number of cash-settled share based incentive plans | Incentive_Plan	2
Number of options to purchase common shares | shares	16,569,134
Number of options granted | shares	13,752,016
Option vesting period	3 years
Option expiration term	7 years
Weighted average fair value of share options granted	$ 1.59	$ 1.79
Average risk-free interest rate	1.00%	1.00%	1.00%
Average expected life | Year	4	4	4
Expected forfeiture rate	5.00%	5.00%	5.00%
Expected volatility	54.00%	50.00%	50.00%
Stock-based compensation expense	$ 3,166,000	$ (32,024,000)
Employee Stock Purchase Plan [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Eligible employees contribute	10.00%
Employees matching contribute percentage	20.00%
Compensation expense	$ 800,000	600,000
Restricted Share Units (RSUs) [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Shares granted to eligible employees vest term	3 years
Stock-based compensation expense	$ (2,115,000)	(10,888,000)
Performance Share Units (PSUs) [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Shares granted to eligible employees vest term	3 years
Stock-based compensation expense	$ 4,188,000	(18,920,000)
Share Appreciation Rights [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
SARs vesting period	5 years
SARs expire period	10 years
SARs intrinsic value	$ 0	0
Stock-based compensation expense	$ 3,000	$ 3,000
Canadian Share Options [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Number of options granted | shares	377,100	615,200	615,200
Weighted average share price		$ 6.37
U.S. Share Options [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Number of options granted | shares	1,165,900	2,130,700	2,130,700
Weighted average share price			$ 5.14
Stock-based compensation expense	$ 3,200,000	$ 4,200,000
Executive Performance Share Units [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Weighted average share price	5.08
Weighted average fair value of share options granted	$ 6.00
Average risk-free interest rate	1.20%
Average expected life | Year	3
Expected volatility	60.00%
Stock-based compensation expense	$ 1,900,000	$ 0
Expected dividend yield	0.00%

X

- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2016-01-13
-Paragraph 47
-Subparagraph a
-Clause i
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-URIDate 2016-03-31

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- Definition

The option life of share options granted.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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The percentage of an expected dividend used to calculate the fair value of share options granted.

+ References

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- Definition

The amount of expense from share-based payment transactions with employees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The intrinsic value of liabilities arising from share-based transactions for which the counterparty's right to cash or other assets had vested by the end of the period (for example, vested share appreciation rights). The intrinsic value is the difference between the fair value of the shares to which the counterparty has the (conditional or unconditional) right to subscribe, or which it has the right to receive, and the price (if any) that the counterparty is (or will be) required to pay for those shares. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services, for which the counterparty's right to cash or other assets had vested by the end of the period (for example, vested share appreciation rights).

+ References

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- Definition

The number of share options granted in a share-based payment arrangement.

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The number of shares reserved for issue under options and contracts for the sale of shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The weighted average share price at the date of exercise for share options that are exercised in a share-based payment arrangement. [Refer: Share-based payment arrangements [member]; Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]]

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Employees contribute percentage.

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Employees matching contribute percentage.

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Employer contribution share purchase plan.

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Expiration period of share appreciation rights.

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Number of cash-settled share-based incentive plans.

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Performance share unit granted to employees vest term.

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Restricted share unit granted to employees vest term.

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Vesting period of share appreciation rights.

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