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Share Based Compensation Plans - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019 CAD ($) shares Year Incentive_Plan | Dec. 31, 2018 CAD ($) shares Year $ / shares | Dec. 31, 2018 CAD ($) $ / shares | Dec. 31, 2017 CAD ($) Year $ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Number of cash-settled share based incentive plans | Incentive_Plan | 2 |  |  |
Option vesting period | 3 years |  |  |
Option expiration term | 7 years |  |  |
Weighted average fair value of share options granted | $ 1.54 | $ 1.96 | $ 1.96 |
Average risk-free interest rate | 2.50% | 2.00% |  |
Average expected life | Year | 4 | 4 |  |
Expected forfeiture rate | 5.00% | 5.00% |  |
Expected volatility | 57.00% | 56.00% |  |
Stock-based compensation expense | $ (8,193,000) | $ (6,390,000) |  |
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 |  | 1,000,000 |  |
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 | $ (5,755,000) | (5,223,000) |  |
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 | $ (1,583,000) | $ (398,000) |  |
U.S. Share Options [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Options Outstanding, Exercised | shares | 0 | 66,000 |  |
Weighted average share price | $ / shares |  |  | $ 4.02 |
Stock-based compensation expense | $ 2,000,000 | $ 3,000,000 |  |
Executive Performance Share Units [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Weighted average share price | $ / shares |  | $ 3.23 |  | $ 4.29
Weighted average fair value of share options granted |  | $ 4.11 | $ 4.11 | $ 6.22
Average risk-free interest rate |  | 2.30% |  | 2.30%
Average expected life | Year |  | 3 |  | 3
Expected volatility |  | 56.00% |  | 59.00%
Stock-based compensation expense |  | $ 12,000,000 |  | $ 6,000,000
Expected dividend yield |  | 0.00% |  | 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 2019-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of share options exercised in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_iv&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 45 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_c&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a&doctype=Standard -URIDate 2019-03-27 + 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 Number of cash-settled share-based incentive plans. + References No definition available. + Details
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- Definition Option Expiration Term + References No definition available. + Details
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- Definition Option Vesting Period In Share based Payment Arrangement + 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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- Details
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