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Share-based payments - Additional Information (Detail) $ in Thousands |  |  | 12 Months Ended |  |
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Nov. 01, 2015 Tranches | May 01, 2014 OptionPlans | Dec. 31, 2017 USD ($) Options shares | Dec. 31, 2016 USD ($) shares Options | Dec. 31, 2015 USD ($) shares Options | Dec. 31, 2017 CAD ($) Options | Dec. 31, 2016 CAD ($) shares Options
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Number of share option plans | OptionPlans |  | 2 |  |  |  |  |
Expense from share-based payment transactions |  |  | $ 11,218 | $ 10,559 |  |  |
Employee stock option plan [member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Term of employee option plan |  |  | 5 years |  |  |  |
Description of option pricing model, share options granted |  |  | Generally, Employee Plan Options granted before November 1, 2015 vest in three equal and separate tranches with the first tranche vesting on the grant date and the second and third tranches vesting on the second and third anniversary dates of the grant date. Employee Plan Options granted on or after November 1, 2015 vest in three equal and separate tranches with vesting commencing one year after the date of grant and the second and third tranches vesting on the second and third anniversary of the grant date. Employee Plan Options are subject to withholding tax on exercise, withholding tax is paid by the Employee Option holder to the Company prior to receipt of the shares received pursuant to exercise. |  |  |  |
Number of tranches | Tranches | 3 |  |  |  |  |  |
Number of share options available to grant under the plan | shares |  |  | 14,155,248 | 14,701,541 |  |  |
Number of share purchase options vested and exercisable | Options |  |  | 18,583,426 | 18,164,617 |  | 18,583,426 | 18,164,617
Weighted average exercise price of share purchase options vested and exercisable |  |  |  |  |  | $ 7.34 | $ 9.64
Expense from share-based payment transactions |  |  | $ 6,736 | $ 6,812 |  |  |
Weighted average fair value per stock option |  |  |  |  |  | $ 1.53 | $ 1.02
Directors and officers stock option plan [member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Term of employee option plan |  |  | 5 years |  |  |  |
Description of option pricing model, share options granted |  |  | Generally, D&O Plan Options granted before November 1, 2015 vest in three equal and separate tranches with the first tranche vesting on the grant date and the second and third tranches vesting on the second and third anniversary dates of the grant date. D&O Plan Options granted on or after November 1, 2015 vest in three equal and separate tranches with vesting commencing one year after the date of grant and the second and third tranches vesting on the second and third anniversary of the grant date. |  |  |  |
Number of tranches | Tranches | 3 |  |  |  |  |  |
Number of share options available to grant under the plan | shares |  |  | 3,720,125 | 4,243,018 |  |  |
Restricted share unit plan [member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Description of option pricing model, share options granted |  |  | The RSUs vest as follows one third on the first anniversary of the grant date, one third on the second anniversary of the grant date and one third on the third anniversary of the grant date. RSUs terminate on the third anniversary of the grant date. |  |  |  |
Number of share purchase options vested and exercisable | shares |  |  |  | 596,780 | 283,736 |  | 596,780
Vesting percentage on first anniversary |  |  | 33.33% |  |  |  |
Vesting percentage on second anniversary |  |  | 33.33% |  |  |  |
Vesting percentage on third anniversary |  |  | 33.33% |  |  |  |
Maximum number of shares reserved for issue under options | Options |  |  | 5,000,000 |  |  | 5,000,000 |
Number of share options granted in share-based payment arrangement | Options |  |  | 936,832 | 784,203 |  |  |
Weighted average fair value per stock option |  |  |  |  |  | $ 4.49 | $ 3.22
Number of share purchased held in trust share-based payment arrangement | shares |  |  |  | 1,706,096 | 549,507 |  |
Compensation expense |  |  |  | $ 2,716 | $ 1,888 |  |
Number of shares outstanding | Options |  |  | 1,706,096 | 1,240,174 | 884,846 | 1,706,096 | 1,240,174
Deferred share units plans [member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Description of option pricing model, share options granted |  |  | Final receipt of the Redemption Notice is due fifteen (15) trading days after the Termination Date but no later than December 31 of the first calendar year commencing after the calendar year in which the Termination Date occurred (the "Redemption Date"), the Participant shall have the right to receive, and shall receive, with respect to all DUs held at the Redemption Date a cash payment equal to the market value of such DUs as of the Redemption Date. |  |  |  |
Trading days |  |  | 15 days |  |  |  |
Number of shares outstanding | Options |  |  | 596,836 | 498,390 |  | 596,836 | 498,390
Liabilities from share-based payment transactions |  |  | $ 866 | $ 1,604 |  |  |
Compensation expense (income) |  |  | $ 1,023 | $ 295 |  |  |
Performance share unit [member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Description of option pricing model, share options granted |  |  | PSUs cliff vest on the third anniversary of the grant date (the "Redemption Date") and are subject to terms and conditions including the achievement of predetermined performance criteria (the "Performance Criteria"). |  |  |  |
Maximum number of shares reserved for issue under options | Options |  |  | 3,130,000 |  |  | 3,130,000 |
Number of share options granted in share-based payment arrangement | Options |  |  | 569,719 | 796,652 |  |  |
Compensation expense |  |  | $ 2,789 | $ 1,564 |  |  |
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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