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Share Capital - Share-based Payment Transactions - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CAD Options yr | Dec. 31, 2016 CAD Options yr | Dec. 31, 2015
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share subject to options, Granted | Options | 4,426,237 | 3,655,020 |
Fair value of options granted | The fair value of options granted is determined at the date of grant using the Black-Scholes option-pricing model. |  |
Number of share subject to options, Granted | 1,229,689 | 995,904 |
Estimated fair value of options granted on the grant date | CAD 5.03 | CAD 5.22 |
Contractual life of share options granted | yr | 3.50 | 3.50 |
Number of options remained unvested | Options | 2,139,320 | 1,826,629 |
Options remained unvested compensation cost | CAD 4,800,000 | CAD 3,900,000 |
Options remained unvested weighted average period | 1.06 | 0.98 |
Performance share units (PSUs) [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares issued | 284,777 | 233,255 |
Number of equity instruments forfeited | 19,617 | 5,243 |
Number of shares outstanding | 685,233 | 576,055 |
Outstanding fair value | CAD 14,300,000 | CAD 15,500,000 |
Performance share units (PSUs) [member] | Bottom of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of units vest percentage | 0.00% |  |
Performance share units (PSUs) [member] | Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of units vest percentage | 200.00% |  |
Deferred share unit [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares issued | 38,625 | 37,325 |
Number of shares outstanding | 438,969 | 466,365 |
Outstanding fair value | CAD 15,500,000 | CAD 16,200,000 |
Estimated historical data [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Contractual life of share options granted | yr | 5 |  |
Officers and employees [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share subject to options, Granted | 4,426,237 | 3,655,020 | 2,980,601
Number of share subject to options, Granted | 1,229,689 | 995,904 |
Officers and employees [member] | Bottom of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share option price per share | CAD 14.33 |  |
Officers and employees [member] | Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share option price per share | CAD 32.90 |  |

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