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Share Based Compensation Plans - Additional Information (Detail) | 12 Months Ended
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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% |  |

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- 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 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_47_a_i&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The option life of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_47_a_i&doctype=Standard -URIDate 2016-03-31 + Details
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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 -Number 2 -IssueDate 2016-01-13 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_47_a_i&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The percentage of an expected dividend used to calculate the fair value of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_47_a_i&doctype=Standard -URIDate 2016-03-31 + Details
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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 -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard -URIDate 2016-03-31 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 51 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_51_b_ii&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The number of share options granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 45 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_45_b_ii&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition 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 -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 79 -Subparagraph a -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_79_a_vii&doctype=Standard -URIDate 2016-03-31 + Details
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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 -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 45 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_45_c&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_47_a&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition Description of expected forfeiture share options granted. + References No definition available. + Details
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- Definition Employees contribute percentage. + References No definition available. + Details
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- Definition Employees matching contribute percentage. + References No definition available. + Details
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- Definition Employer contribution share purchase plan. + References No definition available. + Details
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- Definition Expiration period of share appreciation rights. + References No definition available. + Details
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- Definition Number of cash-settled share-based incentive plans. + References No definition available. + Details
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- References No definition available. + Details
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- References No definition available. + Details
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- Definition Performance share unit granted to employees vest term. + References No definition available. + Details
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- Definition Restricted share unit granted to employees vest term. + References No definition available. + Details
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- Definition Vesting period of share appreciation rights. + References No definition available. + Details
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- Details
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