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v3.19.1

Share-based payments - Additional Information (Detail) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 20, 2018 OptionPlans | Dec. 31, 2018 USD ($) shares Tranches | Dec. 31, 2017 USD ($) shares | Dec. 31, 2018 CAD ($) shares | Dec. 31, 2017 CAD ($) shares | Dec. 31, 2016 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Expense from share-based payment transactions |  | $ 6,989,000 | $ 11,218,000 |  |  |
Employee stock option plan [member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Number of share option plans | OptionPlans | 2 |  |  |  |  |
Expected term |  | 5 years |  |  |  |
Number of tranches | Tranches |  | 3 |  |  |  |
Number of share options available to grant under the plan | shares |  | 3,928,361 | 3,575,074 |  |  |
Number of share purchase options vested and exercisable | shares |  | 3,576,150 | 3,716,685 | 3,576,150 | 3,716,685 |
Weighted average exercise price of share purchase options vested and exercisable |  |  |  | $ 28.13 | $ 36.70 |
Expense from share-based payment transactions |  | $ 3,392,000 | $ 6,736,000 |  |  |
Weighted average fair value per stock option |  |  |  | $ 2.32 | $ 7.65 |
Vesting percentage on first anniversary |  | 33.00% |  |  |  |
Vesting percentage on second anniversary |  | 33.00% |  |  |  |
Vesting percentage on third anniversary |  | 33.00% |  |  |  |
Restricted share unit plan [member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Maximum number of shares reserved for issue under options | shares |  | 5,000,000 |  | 5,000,000 |  |
Number of share purchased held in trust share-based payment arrangement | shares |  | 508,127 | 1,706,096 |  |  |
Restricted Shares Without Performance Criteria [member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Number of share purchase options vested and exercisable | shares |  | 29,371 | 119,356 | 29,371 | 119,356 |
Expense from share-based payment transactions |  | $ 1,425,000 | $ 2,716,000 |  |  |
Vesting percentage on first anniversary |  | 33.00% |  |  |  |
Vesting percentage on second anniversary |  | 33.00% |  |  |  |
Vesting percentage on third anniversary |  | 33.00% |  |  |  |
Number of share options granted in share-based payment arrangement | shares |  | 214,859 | 187,366 |  |  |
Weighted average fair value per stock option |  |  |  | $ 5.88 |  |
Compensation expense |  | $ 1,425,000 | $ 2,716,000 |  |  |
Number of shares outstanding | shares |  | 333,119 | 341,198 | 333,119 | 341,198 | 248,013
Restricted Shares With Performance Criteria [member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Expected term |  | 3 years |  |  |  |
Expense from share-based payment transactions |  | $ 175,000 | $ 0 |  |  |
Number of share options granted in share-based payment arrangement | shares |  | 167,976 | 0 |  |  |
Compensation expense |  | $ 175,000 | $ 0 |  |  |
Number of shares outstanding | shares |  | 152,927 | 0 | 152,927 | 0 |
Restricted Shares With Performance Criteria [member] | Bottom of range [member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Performance target award (range) |  | 0.00% |  |  |  |
Restricted Shares With Performance Criteria [member] | Top of range [member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Performance target award (range) |  | 200.00% |  |  |  |
Deferred share units plans [member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Expense from share-based payment transactions |  | $ (277,000) | $ (1,023,000) |  |  |
Trading days |  | 15 days |  |  |  |
Number of shares outstanding | shares |  | 234,125 | 119,367 | 234,125 | 119,367 |
Liabilities from share-based payment transactions |  | $ 686,000 | $ 866,000 |  |  |
Compensation expense (income) |  | (277,000) | (1,023,000) |  |  |
Performance share unit [member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Expense from share-based payment transactions |  | $ 2,274,000 | $ 2,789,000 |  |  |
Maximum number of shares reserved for issue under options | shares |  | 3,130,000 |  | 3,130,000 |  |
Number of share options granted in share-based payment arrangement | shares |  | 261,522 | 113,938 |  |  |
Compensation expense |  | $ 2,274,000 | $ 2,789,000 |  |  |
Number of shares outstanding | shares |  | 484,899 | 381,293 | 484,899 | 381,293 | 286,188
Performance share unit [member] | Bottom of range [member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Performance target award (range) |  | 0.00% |  |  |  |
Performance share unit [member] | Top of range [member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Performance target award (range) |  | 200.00% |  |  |  |

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