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Share Capital - Summary of Outstanding Share Options (Detail) | 12 Months Ended
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Dec. 31, 2018 CAD ($) yr
Range one [member] |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |
Options Outstanding | 142,540
Weighted Average Remaining Contractual Life in Years, Options Outstanding | yr | 0.16
Weighted Average Exercise Price, Options Outstanding | $ 14.88
Shares Exercisable | 142,540
Weighted Average Remaining Contractual Life in Years, Options Exercisable | yr | 0.16
Weighted Average Exercise Price, Options Exercisable | $ 14.88
Range two [member] |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |
Options Outstanding | 364,526
Weighted Average Remaining Contractual Life in Years, Options Outstanding | yr | 1.16
Weighted Average Exercise Price, Options Outstanding | $ 20.88
Shares Exercisable | 364,526
Weighted Average Remaining Contractual Life in Years, Options Exercisable | yr | 1.16
Weighted Average Exercise Price, Options Exercisable | $ 20.88
Range three [member] |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |
Options Outstanding | 4,480,476
Weighted Average Remaining Contractual Life in Years, Options Outstanding | yr | 3.21
Weighted Average Exercise Price, Options Outstanding | $ 32.46
Shares Exercisable | 2,401,323
Weighted Average Remaining Contractual Life in Years, Options Exercisable | yr | 2.75
Weighted Average Exercise Price, Options Exercisable | $ 32.40
Range four [member] |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |
Options Outstanding | 4,987,542
Weighted Average Remaining Contractual Life in Years, Options Outstanding | yr | 2.98
Weighted Average Exercise Price, Options Outstanding | $ 31.11
Shares Exercisable | 2,908,389
Weighted Average Remaining Contractual Life in Years, Options Exercisable | yr | 2.43
Weighted Average Exercise Price, Options Exercisable | $ 30.10
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 | 14.88
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 | 32.98
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 | $ 32.98

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