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Share Capital - Share-based Payment Transactions - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 CAD ($) yr shares | Dec. 31, 2017 CAD ($) yr shares | Dec. 31, 2016
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
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 | 1,112,779 | 1,229,689 |
Estimated fair value of options granted on the grant date | $ 5.73 | $ 5.03 |
Expected hold period to exercise (years) | yr | 3.50 | 3.50 |
Options remained unvested compensation cost | $ 5,200,000 | $ 4,800,000 |
Options remained unvested weighted average period | yr | 1.06 | 1.06 |
Performance share units (PSUs) [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of shares issued | 280,884 | 284,777 |
Number of equity instruments forfeited | 29,668 | 19,617 |
Number of shares outstanding | 744,081 | 686,250 |
Outstanding fair value | $ 6,000,000 | $ 14,300,000 |
Number of shares paid | shares | 193,385 |  |
Paid at fair value | $ 3,200,000 |  |
Performance share units (PSUs) [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of units vest percentage | 0.00% |  |
Performance share units (PSUs) [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of units vest percentage | 200.00% |  |
Deferred share unit [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of shares issued | 46,356 | 38,625 |
Number of shares outstanding | 306,459 | 438,969 |
Outstanding fair value | $ 9,000,000 | $ 15,500,000 |
Number of shares paid | shares | 178,866 | 66,021 |
Paid at fair value | $ 6,200,000 | $ 2,100,000 |
Estimated historical data [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Expected hold period to exercise (years) | yr | 5 |  |
Officers and employees [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share subject to options, Granted | 4,987,542 | 4,426,237 | 3,655,020
Number of share subject to options, Granted | 1,112,779 | 1,229,689 |
Officers and employees [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Share option price per share | $ 14.88 |  |
Officers and employees [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Share option price per share | $ 32.98 |  |

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