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Equity - Summary of Information Relating to Share Options Outstanding (Detail) | Dec. 31, 2017 CAD mo | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding share options | 22,068,000 | 22,854,000 | 15,929,000
Weighted average remaining life of outstanding options | mo | 81 |  |
Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | CAD 4.15 |  |
Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | CAD 58.80 |  |
$ 4.15-$12.35 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding share options | 8,018,000 |  |
Weighted average remaining life of outstanding options | mo | 91 |  |
$ 4.15-$12.35 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | CAD 4.15 |  |
$ 4.15-$12.35 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | CAD 12.35 |  |
$12.36-$20.14 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding share options | 5,083,000 |  |
Weighted average remaining life of outstanding options | mo | 86 |  |
$12.36-$20.14 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | CAD 12.36 |  |
$12.36-$20.14 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | CAD 20.14 |  |
$20.15-$26.79 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding share options | 2,734,000 |  |
Weighted average remaining life of outstanding options | mo | 74 |  |
$20.15-$26.79 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | CAD 20.15 |  |
$20.15-$26.79 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | CAD 26.79 |  |
$26.80-$36.85 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding share options | 4,527,000 |  |
Weighted average remaining life of outstanding options | mo | 77 |  |
$26.80-$36.85 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | CAD 26.80 |  |
$26.80-$36.85 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | CAD 36.85 |  |
$36.86-$58.80 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding share options | 1,706,000 |  |
Weighted average remaining life of outstanding options | mo | 45 |  |
$36.86-$58.80 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | CAD 36.86 |  |
$36.86-$58.80 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price range | CAD 58.80 |  |

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