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Share Capital - Summary of Outstanding Share Options (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CAD Options yr | Dec. 31, 2016 Options
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |
Options Outstanding | Options | 4,426,237 | 3,655,020
Range one [member] |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |
Options Outstanding | 337,714 |
Weighted Average Remaining Contractual Life in Years, Options Outstanding | yr | 0.87 |
Weighted Average Exercise Price, Options Outstanding | CAD 14.73 |
Shares Exercisable | 337,714 |
Weighted Average Remaining Contractual Life in Years, Options Exercisable | yr | 0.87 |
Weighted Average Exercise Price, Options Exercisable | CAD 14.73 |
Range two [member] |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |
Options Outstanding | 432,367 |
Weighted Average Remaining Contractual Life in Years, Options Outstanding | yr | 2.16 |
Weighted Average Exercise Price, Options Outstanding | CAD 20.88 |
Shares Exercisable | 432,367 |
Weighted Average Remaining Contractual Life in Years, Options Exercisable | yr | 2.16 |
Weighted Average Exercise Price, Options Exercisable | CAD 20.88 |
Range three [member] |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |
Options Outstanding | 3,656,156 |
Weighted Average Remaining Contractual Life in Years, Options Outstanding | yr | 3.86 |
Weighted Average Exercise Price, Options Outstanding | CAD 32.29 |
Shares Exercisable | 1,516,836 |
Weighted Average Remaining Contractual Life in Years, Options Exercisable | yr | 3.58 |
Weighted Average Exercise Price, Options Exercisable | CAD 32.56 |
Range four [member] |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |
Options Outstanding | 4,426,237 |
Weighted Average Remaining Contractual Life in Years, Options Outstanding | yr | 3.46 |
Weighted Average Exercise Price, Options Outstanding | CAD 29.84 |
Shares Exercisable | 2,286,917 |
Weighted Average Remaining Contractual Life in Years, Options Exercisable | yr | 2.91 |
Weighted Average Exercise Price, Options Exercisable | CAD 27.72 |
Bottom of range [member] | Range one [member] |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |
Range of Exercise Prices | 14.33 |
Bottom of range [member] | Range three [member] |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |
Range of Exercise Prices | 31.75 |
Bottom of range [member] | Range four [member] |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |
Range of Exercise Prices | 14.33 |
Top of range [member] | Range one [member] |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |
Range of Exercise Prices | 14.88 |
Top of range [member] | Range two [member] |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |
Range of Exercise Prices | 20.88 |
Top of range [member] | Range three [member] |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |
Range of Exercise Prices | 32.90 |
Top of range [member] | Range four [member] |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |
Range of Exercise Prices | CAD 32.90 |

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